The Oral Microbiome: Your Mouth Is an Ecosystem

Rethinking bacteria, biofilm, saliva, mouthwash, toothpaste—and the connection between oral and whole-body health

By Whitney Rutledge, DC | Prairie Wellness Center

Published October 25, 2026

When we think about oral health, we often think about keeping the mouth clean: brushing away plaque, killing bacteria, preventing cavities and keeping our breath fresh.

But the mouth was never meant to be sterile.

It is home to a complex community of bacteria, fungi, viruses and other microorganisms collectively known as the oral microbiome. These organisms live on the teeth, gums, tongue, cheeks and within saliva, forming distinct microbial communities in different areas of the mouth.

Many of these microorganisms are normal—and some perform useful functions.

The goal of oral health, therefore, may not simply be to eliminate microbes. It is to help maintain an environment in which beneficial and neutral organisms can coexist without allowing disease-associated communities to dominate.

That shifts the conversation from:

How do we kill bacteria?

to:

How do we support a healthy oral ecosystem?

The Mouth Is a Living Microbial Environment

A healthy oral microbiome is remarkably complex.

Different microbial communities prefer different environments. The bacteria living on the tongue are not necessarily the same as those living between teeth, below the gumline or suspended in saliva.

These organisms interact continuously with:

saliva
oxygen
dietary carbohydrates
minerals
oral pH
immune activity
medications
dental materials
toothpaste and mouthwash
brushing and interdental cleaning
smoking and vaping
hydration
hormonal and metabolic health

A healthy microbiome is therefore not defined by the complete absence of potentially harmful organisms.

It is better understood as a stable, resilient ecosystem in which the surrounding environment keeps microbial communities from shifting toward disease.

When that ecological balance changes, organisms associated with cavities, gingival inflammation and periodontal disease may gain an advantage.

This process is often described as dysbiosis.

Plaque Is More Than Loose Bacteria

Dental plaque is a biofilm.

That distinction matters.

A biofilm is an organized community of microorganisms attached to a surface and surrounded by a protective extracellular matrix. Once microbes are living within a mature biofilm, they behave differently than free-floating bacteria.

This is one reason that simply exposing the mouth to something antimicrobial is not necessarily the same thing as physically removing established plaque.

Some mouthwashes can reduce bacterial activity, plaque accumulation and gingival inflammation. But mechanical disruption remains important.

Brushing, cleaning between the teeth and professional dental care physically disturb the biofilm and alter the environment in which it grows.

The question is not whether antimicrobial products can work—they can.

The better question is:

When are they useful, and how do we use them without assuming that more microbial killing is always better?

Saliva: One of the Mouth's Most Important Defenses

Saliva does far more than keep the mouth moist.

It helps:

wash food particles and microorganisms away from tooth surfaces
neutralize acids
buffer changes in oral pH
provide calcium and phosphate needed for remineralization
lubricate and protect oral tissues
participate in immune defense
transport nutrients and microbial metabolites

When saliva production decreases, the oral environment changes dramatically.

Dry mouth—or xerostomia—may increase vulnerability to cavities, irritation, difficulty swallowing, altered taste and other oral problems.

Medications are a common contributor to dry mouth, but dehydration, aging, autoimmune disease, radiation therapy and other medical conditions can also affect salivary flow.

This is why oral health cannot always be reduced to how often someone brushes.

Sometimes the environment surrounding the teeth has changed.

Oral pH and the Ecology of Cavities

Every time certain oral bacteria metabolize fermentable carbohydrates, acids are produced.

As the pH surrounding the teeth drops, minerals can begin leaving the enamel.

Saliva helps reverse this process by buffering acids and providing minerals that support remineralization.

Frequent acidic conditions can gradually favor microbial communities that tolerate—and continue producing—acid.

That means cavities are not simply the result of having one particular “bad bacterium.”

Dental caries is an ecological process involving the interaction between:

microbes + diet + saliva + time + tooth structure + oral hygiene + mineral balance

This is one reason supporting saliva and reducing repeated acid exposure may be just as important as focusing on individual microorganisms.

Mouthwash: Helpful Tool or Too Much of a Good Thing?

Mouthwash deserves a more nuanced conversation than either:

“Everyone should use it every day.”

“Mouthwash destroys the microbiome.”

Neither statement adequately reflects the evidence.

Antiseptic mouthwashes containing ingredients such as chlorhexidine, cetylpyridinium chloride or essential oils can reduce plaque and gingival inflammation. In certain clinical situations, these effects can be very useful.

But oral bacteria do more than contribute to plaque.

Some bacteria participate in the conversion of dietary nitrate into nitrite—an early step in the body's nitrate–nitrite–nitric oxide pathway.

Nitric oxide plays important roles in vascular biology, including regulation of blood-vessel tone.

Studies have shown that some antibacterial mouthwashes can reduce oral nitrate-to-nitrite conversion. Several small human studies have also investigated whether this could influence blood pressure.

The results, however, are mixed.

While individual studies have reported increases in blood pressure following antiseptic mouthwash use, pooled research has not consistently demonstrated a clinically significant rise in blood pressure.

So the science does not currently support saying that mouthwash inevitably causes hypertension.

What it does support is something more interesting:

Oral bacteria participate in human physiology.

That alone changes the way we think about routinely sterilizing the mouth.

Therapeutic mouthwash still has an important role when clinically appropriate. The goal is thoughtful use rather than assuming that the strongest antimicrobial product is automatically the healthiest choice for every person, every day.

Fluoride: Dental Benefit Does Not End the Safety Conversation

Fluoride can reduce dental caries.

That fact is well established.

But acknowledging a dental benefit does not require us to stop asking questions about dose, route of exposure, cumulative intake or effects elsewhere in the body.

That distinction becomes especially important because there are two very different conversations surrounding fluoride:

Topical fluoride exposure

Fluoride present at the surface of the tooth can reduce demineralization and promote remineralization of enamel.

Systemic fluoride exposure

Fluoride that is swallowed enters the gastrointestinal tract and systemic circulation.

These are not identical exposures.

Modern research indicates that much of fluoride's cavity-preventing action occurs topically at the tooth surface, which raises an important question:

If the desired effect is largely local, how should we evaluate lifelong systemic ingestion?

That deserves a genuine risk–benefit conversation rather than an assumption that a substance proven to benefit teeth must therefore be biologically neutral everywhere else in the body.

Where Does Chronic Systemic Fluoride Exposure Come From?

Fluoride exposure does not come from toothpaste alone.

Potential sources include:

naturally occurring fluoride in groundwater
fluoride intentionally added to municipal drinking water
bottled water containing naturally occurring or added fluoride
beverages manufactured with fluoridated water
foods processed or prepared with fluoridated water
tea, which naturally accumulates fluoride from soil
infant formula mixed with fluoridated water
swallowed fluoride toothpaste
swallowed fluoride mouth rinses
fluoride-containing dietary supplements
certain fluorine-containing medications that can release inorganic fluoride during metabolism

What About Fluorine-Containing Medications?

Fluorine is widely used in modern pharmaceutical chemistry. Many medications contain one or more fluorine atoms because fluorination can change a drug's stability, absorption, potency and metabolism.

However, an important distinction is necessary:

A medication that contains fluorine is not automatically equivalent to ingesting

fluoride.

In many pharmaceutical compounds, fluorine is tightly bound to carbon and remains part of the drug molecule or its metabolites. These medicines should not automatically be counted as though each fluorine atom becomes a free fluoride ion in the body.

Some medications, however, can undergo metabolic defluorination and release inorganic fluoride.

A well-documented example is the antifungal drug voriconazole. During prolonged treatment, voriconazole can produce substantial systemic fluoride exposure.

Elevated blood fluoride concentrations and fluoride-associated bone changes, including periostitis and skeletal pain, have been documented in patients receiving long-term therapy.

Certain fluorinated inhaled anesthetics can also be metabolized to inorganic fluoride. Historically, methoxyflurane demonstrated that drug metabolism can generate enough fluoride to produce clinically important toxicity at sufficiently high exposure. Newer anesthetic agents differ considerably in their metabolism and safety profiles, so the presence of fluorine in an anesthetic—or any other medication—does not by itself establish toxicity.

The larger point is an important one:

Medications can be another potential source of fluoride exposure, but the chemical form and metabolism of each medication determine whether that fluorine actually becomes biologically available fluoride.

For someone evaluating cumulative fluoride exposure, medication history may therefore deserve consideration alongside drinking water, dental products, beverages, food, supplements and other environmental sources.

Tea deserves special mention.

The tea plant naturally accumulates fluoride, and concentrations vary widely according to leaf age, type of tea, growing conditions and brewing time. Some black and brick teas can contribute meaningful amounts to daily fluoride intake.

This illustrates why total exposure matters.

Someone drinking fluoridated water, consuming beverages manufactured with fluoridated water, drinking several cups of tea and using fluoride-containing dental products may have a very different cumulative exposure from someone using fluoride toothpaste topically but drinking low-fluoride water.

Young children also deserve special consideration because they commonly swallow some toothpaste while learning to brush.

Dental fluorosis itself is evidence that swallowed fluoride can reach developing tissues. It occurs when excessive fluoride exposure during tooth development alters enamel formation.

Fluoride Does Not Remain Only in the Mouth

Most swallowed fluoride is absorbed through the gastrointestinal tract.

After entering circulation, fluoride is distributed throughout the body.

A substantial portion of absorbed fluoride is retained in mineralized tissues—particularly bones and teeth—while the kidneys provide the major route of elimination.

This means chronic systemic exposure is biologically different from briefly exposing the surface of a tooth to fluoride and spitting the product out.

It also means that renal function matters.

People with impaired kidney function may eliminate fluoride less efficiently, potentially increasing retention.

Again, the point is not that any exposure automatically produces toxicity.

The point is that:

exposure + dose + duration + life stage + kidney function + other sources all matter.

Fluoride and the Developing Brain

One of the most important developments in the modern fluoride debate involves neurodevelopment.

In 2024, the U.S. National Toxicology Program completed an extensive systematic review of fluoride exposure and neurodevelopment.

Its conclusion deserves careful wording.

The NTP reported moderate confidence that higher fluoride exposure is associated with lower IQ in children, particularly at exposures represented by drinking-water concentrations above approximately 1.5 mg/L.

The NTP did not conclude that the currently used U.S. community-water concentration of approximately 0.7 mg/L has been proven to reduce IQ.

It concluded that the available evidence at that lower exposure level was insufficient to determine the answer confidently.

A subsequent large systematic review and meta-analysis published in JAMA Pediatrics in 2025 also reported an inverse association between fluoride exposure and children's IQ across the available international literature.

However, important limitations remain.

Many studies were observational. Study quality varied. Most research was conducted outside the United States, and determining effects specifically at lower drinking-water concentrations remains more difficult.

That leaves us with neither of the simplistic statements sometimes heard in this debate:

“Fluoride has been proven to damage every child's brain.”

Nor:

“There is absolutely no reason to investigate neurodevelopmental effects at current exposures.”

Neither accurately describes the evidence.

The responsible conclusion is that higher fluoride exposure has become a legitimate neurodevelopmental concern, while the effects of lower chronic exposure remain an active area of investigation.

As of 2026, the U.S. Environmental Protection Agency is conducting a new human-health toxicity assessment of fluoride in drinking water.

This question is not scientifically closed.

Fluoride, the Thyroid and Endocrine Health

The thyroid has also been investigated because fluoride can interact with biological systems involved in mineral and endocrine regulation.

Human studies examining fluoride and thyroid function have produced varying results.

Recent systematic reviews suggest that higher fluoride exposure, particularly in populations drinking water containing substantially elevated fluoride concentrations, may be associated with increased thyroid-stimulating hormone and some thyroid dysfunction.

The evidence is considerably less clear at lower exposures.

Iodine status may also matter, making this a more complex question than simply comparing fluoridated and non-fluoridated communities.

At this point, it would be inappropriate to claim that ordinary fluoride exposure has been proven to cause hypothyroidism.

It would be equally inappropriate to suggest that thyroid effects have never been observed or deserve no further investigation.

Fluoride and Bone

Bone is one of the body's major fluoride storage sites.

At sufficiently high chronic exposures, fluoride can cause skeletal fluorosis, a disorder characterized by abnormal changes in bone and joints.

This is not controversial.

The larger scientific question is what occurs across the much lower range of chronic exposures experienced by most people.

Studies evaluating bone density and fracture risk at community-water concentrations have produced mixed results and generally have not demonstrated a clear increase in fracture risk from conventional fluoridation levels.

At higher exposures, however, the biological effects of fluoride on bone become increasingly important.

This is another reminder that asking simply whether fluoride is “safe” or “unsafe” misses the fundamental principle of toxicology:

The dose matters.

What About Cancer?

Cancer deserves careful discussion rather than dismissal—or exaggeration.

Because fluoride accumulates in bone, researchers have paid particular attention to osteosarcoma, a rare primary bone cancer.

Animal findings and some human epidemiologic studies raised enough concern to prompt continued investigation.

However, the human literature has not established that fluoridated drinking water causes cancer.

A recent systematic review examining fluoride exposure and primary bone cancers found that most included studies did not identify a positive association. A small number did report associations, particularly among males, highlighting why the question has continued to receive scientific attention.

Likewise, large epidemiologic reviews have not demonstrated a consistent increase in overall cancer incidence or cancer mortality in fluoridated communities.

So our conclusion should reflect the evidence honestly:

A causal relationship between community water fluoridation and cancer has not been established.

But that is different from saying that the subject has never raised legitimate scientific questions.

Good science requires us to distinguish between:

a signal worth investigating

and

a causal relationship that has actually been demonstrated.

Those are not the same thing.

Community Water Fluoridation: Benefits and Tradeoffs

For decades, community water fluoridation has been presented as one of the major public-health strategies for preventing tooth decay.

Much of the original evidence supporting large reductions in cavities, however, came from a period before fluoride toothpaste became nearly universal.

A major 2024 Cochrane review examining more contemporary evidence concluded that community water fluoridation may still modestly reduce tooth decay in children, but that the benefit appears smaller today than it was before widespread fluoride toothpaste use.

Evidence for several outcomes was rated low or very low certainty.

That matters when considering risk and benefit.

If people can receive substantial topical fluoride exposure directly through toothpaste and professional dental treatments, it is reasonable for researchers and policymakers to continue examining whether chronic systemic exposure through an entire community water supply provides the same balance of benefit and risk that was assumed decades ago.

This is not an argument that everyone should stop using fluoride.

It is an argument for asking a more sophisticated question:

What is the minimum exposure necessary to achieve the desired dental benefit while minimizing unnecessary systemic exposure?

Fluoride and Hydroxyapatite: Expanding the Conversation

Fluoride is not the only mineral capable of supporting enamel.

Another mineral receiving increasing attention is hydroxyapatite.

Hydroxyapatite is a calcium-phosphate mineral closely related to the mineral structure of teeth and bone.

Hydroxyapatite-containing toothpastes are being studied for their ability to:

support enamel remineralization
reduce demineralization
decrease dental sensitivity
help prevent dental caries

Recent randomized clinical trials and systematic reviews have produced encouraging results, including studies in which hydroxyapatite toothpastes performed comparably with fluoride toothpastes for certain caries-related outcomes.

That does not mean the evidence bases are identical.

Fluoride has been studied for far longer and in far larger populations.

But hydroxyapatite gives patients and clinicians another scientifically plausible option—particularly for people who wish to reduce swallowed fluoride exposure while continuing to support remineralization.

Rather than reducing the discussion to:

fluoride versus hydroxyapatite

we prefer a more useful question:

What approach provides effective cavity prevention while respecting the patient's overall health, exposure history, dental risk and preferences?

Know Your Total Exposure

When evaluating fluoride, looking only at toothpaste can underestimate total exposure.

Consider:

What is the fluoride concentration in your drinking water?
Is your water naturally fluoridated or adjusted by the community?
Do you use private well water?
How much tea do you drink?
Are commercial beverages a major part of your diet?
Is infant formula being prepared with fluoridated water?
Are young children swallowing toothpaste?
Are fluoride mouth rinses or supplements also being used?
Is kidney function impaired?

People using private wells should have their water tested rather than assuming fluoride levels are low.

Bottled water also varies considerably.

For people intentionally trying to reduce fluoride in drinking water, filtration methods differ. Standard pitcher or activated-carbon filters are generally designed primarily for taste and odor and should not automatically be assumed to remove fluoride.

Certain reverse-osmosis systems can reduce fluoride, but the individual product should be certified for that purpose.

The point is not to create fear around water.

It is to make exposure visible so that people can make informed choices.

What About Water Flossers?

Water irrigation can be a useful addition to home oral care, particularly for people who struggle with traditional interdental cleaning.

Clinical trials suggest that oral irrigators may improve measures of gingival inflammation and bleeding when used in addition to toothbrushing.

But again, an important distinction applies:

Irrigation and brushing do not perform exactly the same job.

A water flosser can flush debris and affect bacterial activity within difficult-to-reach areas, while brushing and other forms of mechanical cleaning physically disrupt attached biofilm.

For many people, the best strategy is not choosing one tool over another, but combining methods that they can use consistently and effectively.

Specialty Toothpastes, Botanical Products and Oral Rinses

The oral-care market now includes products containing probiotics, essential oils, botanical extracts, hydroxyapatite, enzymes and numerous antimicrobial compounds.

Some are promising.

Some have meaningful clinical research behind particular ingredients.

Others are marketed considerably faster than the evidence develops.

Products may also affect individuals differently. Flavoring agents, essential oils, detergents, preservatives and botanical ingredients can occasionally irritate oral tissues or the skin surrounding the mouth.

If irritation begins after introducing a new toothpaste, rinse or oral-care product, the product itself should be considered as one possible contributor.

A natural product is not automatically non-irritating, just as a conventional product is not automatically harmful.

Ingredients—and the individual using them—matter.

What About Oral Microbiome Testing?

Not all oral microbiome tests are the same.

Some newer tests use broad sequencing techniques to characterize large portions of the microbial community living in the mouth.

Others are much more targeted.

Tests such as OralDNA's MyPerioPath®, for example, use quantitative PCR (qPCR) to identify and measure a defined group of periodontal bacteria from an oral-rinse sample. Rather than attempting to describe the entire oral microbiome, this type of testing asks a narrower question:

Are particular organisms associated with periodontal disease present—and in what quantity?

That can provide clinically useful information.

Targeted testing may help a healthcare provider:

identify periodontal pathogens that may not be apparent from symptoms alone
quantify the relative burden of selected organisms
interpret microbial findings alongside bleeding, pocket depth, attachment loss and other periodontal findings
repeat testing after treatment to see whether levels of specific organisms have changed
recognize situations in which persistent organisms may warrant additional dental or periodontal evaluation

This is quite different from simply receiving a long list of bacteria from a broad microbiome sequencing panel.

But there are still important limitations.

An oral-rinse sample collects organisms from many areas of the mouth at once. It does not necessarily reveal exactly where those organisms are living, and microbial communities below the gumline may differ substantially from those found in saliva or an oral rinse.

Targeted PCR panels also measure the organisms they were designed to look for.

They do not characterize the entire oral ecosystem, including the many commensal organisms and microbial interactions that may contribute to resilience or dysbiosis.

And perhaps most importantly:

Detecting an organism is not the same as diagnosing a disease.

Periodontal disease is influenced by microbial burden, biofilm ecology, host immune response, smoking, diabetes, genetics, oral hygiene, medications and other factors.

The same principle applies to the much-discussed mouth–body connection.

Finding an oral organism that has also been associated with cardiovascular disease, diabetes, adverse pregnancy outcomes, rheumatoid disease or other conditions does not prove that the organism caused that condition in an individual patient.

Some individual organisms do deserve particular attention. Porphyromonas gingivalis, for example, has been studied extensively in relation to cardiovascular disease, rheumatoid arthritis and neurodegenerative disease, while Fusobacterium nucleatum has an especially notable body of research linking it with adverse pregnancy outcomes and colorectal cancer.

But even these stronger associations require careful interpretation.

Finding F. nucleatum in an oral-rinse sample is not the same as finding it within colorectal tumor tissue. Finding P. gingivalis in the mouth does not diagnose cardiovascular disease, rheumatoid arthritis or Alzheimer's disease.

Another organism worth watching is Parvimonas micra—formerly classified as Peptostreptococcus micros or Micromonas micros. Emerging research has repeatedly found it enriched in colorectal cancer studies, making it an interesting example of how the science can evolve faster than commercial interpretation charts. Its presence in an oral sample does not diagnose colorectal cancer, but it is a reminder that organism–disease relationships are still being refined and should be interpreted using current research rather than static graphics alone.

The presence of these organisms may reveal something important about the oral ecosystem and may provide another reason to take periodontal inflammation seriously. It may also help generate useful clinical questions.

It should not, however, be turned into a systemic diagnosis that the test itself was never designed to make.

Associations may be clinically meaningful and worthy of attention without automatically establishing causation.

For that reason, oral microbial testing is best viewed as another piece of clinical information rather than a stand-alone diagnosis.

Used thoughtfully—and interpreted alongside dental examination, periodontal measurements, symptoms, medical history and other findings—targeted molecular testing may help us understand an important part of the oral environment that traditional examination alone cannot directly measure.

The technology is real.

The information can be useful.

The interpretation is where good clinical judgment still matters.

The Mouth–Body Connection

The mouth is not isolated from the rest of the body.

Research has repeatedly identified associations between periodontal disease and conditions including cardiovascular disease, diabetes and some respiratory disorders.

Potential mechanisms include:

systemic inflammatory signaling
transient entry of oral microorganisms or microbial components into circulation
immune-system activation
metabolic interactions
changes in endothelial function

The relationship is particularly well established between periodontal disease and diabetes, where each condition can influence the other.

Research also continues into relationships between oral microbial patterns and pregnancy outcomes, neurodegenerative disease, autoimmune disease and other chronic conditions.

But this is an area where careful wording matters.

An association does not automatically prove that changes in the oral microbiome caused a particular systemic disease.

Many conditions share common risk factors including smoking, diet, age, metabolic health, inflammation, medications and socioeconomic factors.

The science of the mouth–body connection is important precisely because it is complex.

Supporting a Healthy Oral Ecosystem

For most people, supporting oral health still begins with remarkably basic practices:

brush thoroughly twice daily
clean between the teeth
maintain regular dental examinations and professional cleanings
address persistent gum bleeding rather than normalizing it
pay attention to chronic dry mouth
reduce frequent sugar and acid exposure
remain adequately hydrated
avoid smoking and tobacco exposure
discuss medication-related dry mouth with your healthcare providers
understand your sources of fluoride exposure
choose oral-care products according to individual needs rather than marketing alone

And perhaps most importantly:

Stop thinking of the mouth as a dirty place that needs to be sterilized.

It is an ecosystem.

The goal is not the elimination of life.

The goal is balance, resilience and an environment that supports health.

A Whole-Person View of Oral Health

At Prairie Wellness Center, we are fascinated by the places where seemingly separate systems of the body intersect.

The oral microbiome is one of those intersections.

Saliva, nutrition, microbial ecology, inflammation, medications, metabolism and oral hygiene all influence the environment of the mouth—and researchers are continuing to uncover ways in which oral health intersects with health throughout the body.

This does not replace routine dental care.

It expands the conversation.

Because sometimes asking a better question changes what we are able to see.

Instead of simply asking:

“Which bacteria should we kill?”

perhaps we should also be asking:

“What kind of environment are we creating—and which organisms does that environment allow to thrive?”

And instead of asking only:

“Does this substance benefit teeth?”

perhaps we should also ask:

“What happens when we are exposed to it throughout the body, every day, for decades?”

Those are not anti-science questions.

They are exactly the kinds of questions science is supposed to ask.

That is where the oral microbiome becomes much more than a story about teeth.

It becomes another window into the remarkable ecology of the human body.

Prairie Wellness Center in Topeka, Kansas explores emerging research through a whole-person lens, connecting oral health, nutrition, microbial ecology, environmental exposures and the body’s interconnected systems.

Explore more Perspectives & Discoveries →

Sources & Further Reading

The following sources were used to inform this discussion and provide additional context for readers who would like to explore the research in greater depth.

Periodontal Ecosystem and Clinical Implications of the Oral Microbiome: A Narrative Review. International Journal of Dentistry, 2026.
Overview of oral microbial ecology, dysbiosis, biofilm behavior and host–microbe interactions.
The Effect of Antibacterial Mouthwash on Blood Pressure in Humans: A Scoping Review. 2026.
Reviews human research examining antibacterial mouthwash, nitrate-reducing oral bacteria, nitric oxide physiology and blood pressure.
Fluoride — Health Professional Fact Sheet. National Institutes of Health, Office of Dietary Supplements.
Overview of fluoride sources, gastrointestinal absorption, retention in bone and teeth, urinary elimination and dietary exposure.
State of the Science Concerning Fluoride Exposure and Neurodevelopment and Cognition: A Systematic Review. National Toxicology Program, 2024.
Comprehensive federal systematic review of fluoride exposure and neurodevelopmental outcomes.
Fluoride Exposure and Children’s IQ Scores: A Systematic Review and Meta-Analysis. JAMA Pediatrics, 2025.
Meta-analysis examining associations between fluoride exposure and childhood IQ across 74 studies.
Water Fluoridation for the Prevention of Dental Caries. Cochrane Database of Systematic Reviews, 2024.
Updated review examining contemporary evidence for the dental benefits of community water fluoridation.
Does Fluoride Exposure Affect Thyroid Function? A Systematic Review and Dose-Response Meta-Analysis. Environmental Research, 2024.
Examines fluoride exposure, thyroid-stimulating hormone and thyroid outcomes across human studies.
Exposure to Fluoride and Risk of Primary Bone Cancer: A Systematic Review. Bone, 2025.
Reviews human evidence examining fluoride exposure and primary bone cancers, including osteosarcoma.
Clinical Evidence of Caries Prevention by Hydroxyapatite: An Updated Systematic Review and Meta-Analysis. 2024.
Reviews clinical and in-situ evidence for hydroxyapatite-containing oral-care products as an anti-caries strategy.
Periodontal Disease and Atherosclerotic Cardiovascular Disease: A Scientific Statement from the American Heart Association. Circulation, 2025.
Reviews associations, proposed mechanisms and limitations in the evidence connecting periodontal disease with cardiovascular disease.
MyPerioPath® — OralDNA Labs.
Technical and clinical information regarding the targeted qPCR oral-rinse assay discussed in this article.
Parvimonas micra Promotes Carcinogenesis of Colorectal Cancer Through Phenyllactic Acid-Induced DNA Damage. Clinical and Translational Medicine, 2026.
Recent research exploring a possible mechanistic relationship between P. micra and colorectal carcinogenesis.
Fusobacterium nucleatum and Response to Treatment in Colon and Rectal Cancer: A Systematic Review. 2026.
Reviews emerging evidence concerning F. nucleatum in colorectal tumors and treatment outcomes.
U.S. EPA — Fluoride in Drinking Water. 2026.
Current information regarding EPA’s ongoing human-health toxicity assessment of fluoride in drinking water.

*Research in the oral microbiome and oral–systemic health is evolving rapidly. Inclusion of a study or source does not imply that an association establishes causation or that findings apply equally to every individual.