Dental health and general wellbeing

The link between dental health and general wellness is strong, for two distinct reasons:

The mouth is the main entry into the body for anything — good or bad
The condition of the mouth itself affects the condition of the rest of the body

Holistic dentistry seeks to maintain harmony in the body by addressing both — see what is holistic dentistry? and the benefits of holistic dentistry.

A note on how to read the rest of this page. The strength of evidence behind these links varies a great deal, and it is worth saying which is which. The diabetes relationship below is supported by evidence running in both directions, including treatment studies. The cardiovascular and respiratory links are associations — real, repeatedly observed, and not the same thing as proof that treating one changes the other. This page distinguishes them rather than lumping them together.

1. The mouth as entry point

The beneficial things entering the body through the mouth are nutritious foods.

The detrimental things are toxins — tobacco, and some medications.

So good dental health starts with a healthy diet limiting sugars, especially refined sugars, and is maintained by minimising toxins, including those delivered by smoking, medications and unprescribed drugs. See how does your diet affect your teeth?, sugar: what does it do to your teeth? — where the load-bearing point is that frequency of exposure matters more than total quantity — and six foods to avoid for healthy teeth. On the toxin side: the effects of vaping on your oral health and are e-cigarettes bad for my teeth?, where the honest position is that the vaping evidence base is much younger than the tobacco one.

Many medications also reduce saliva, which raises decay risk independently of diet — my mouth is always dry — does it affect my teeth? and my mouth always feels dry! What can I do?

Materials matter too

The methods used to treat dental disease and the restorative materials used are also important, because these materials have a long life in the mouth. Something placed in a tooth at 30 may still be there at 60. How long do dental fillings last? gives realistic figures.

Holistic dentists:

Avoid materials that are toxic to the body, such as mercury amalgam
Use biocompatible composite resin or pure porcelain restorations instead — dental fillings: porcelain, amalgam or composite resin? and tooth fillings
Encourage digital X-rays, which emit half as much radiation as conventional X-rays — how safe are dental x-rays?
Practise less invasively than conventional dentistry — which begins with catching disease early enough that intervention stays small. Can you reverse tooth decay?
Encourage dental implants for missing teeth, since implants are titanium — a very safe metal to use in the mouth. What are the replacement options for missing teeth?

In fairness to the other side of that first point: the Australian Dental Association, the US Food and Drug Administration and the World Health Organization all consider dental amalgam safe for general use. The preference for alternatives here is a practice philosophy and a matter of patient choice, not a finding that amalgam has been shown to cause harm at the doses involved. Is it safe to visit the dentist during pregnancy? sets out the one situation — pregnancy — where amalgam placement and removal are routinely deferred.

2. The mouth as microclimate

The mouth has a rich nerve and blood supply and is full of bacteria.

The bacteria linked to decay, to periodontal disease, and to systemic diseases all increase in the absence of good oral hygiene and regular dental appointments. See how does tooth decay develop?, what is gum disease?, periodontal (gum) disease, what is the ideal daily routine for oral hygiene? and is flossing really that important?

When those bacteria get out of control they cause serious gum infections — which give bacteria an opportunity to enter the bloodstream. That is the mechanism connecting everything below — and it is a plausible mechanism rather than a demonstrated chain of cause and effect in every case. Bleeding gums is the earliest sign, and when do you need deeper cleaning? the usual response.

In children

Severe dental caries affects general wellbeing at any age. In a child, when eating and sleeping are disrupted by discomfort and pain from infection, the result can be:

poor nutrition, leading to impaired growth and development
missed school
increased possibility of hospitalisation if left untreated

This one is not contested — Victorians’ love of soft drink wreaks havoc with teeth reports that dental conditions were the most common cause of potentially preventable hospitalisation in Victorians under 19. Protecting your child from dental disease, when should a child first visit the dentist? and children’s dentistry cover the prevention.

Diabetes

Untreated cavities and periodontal disease in adults contribute to general diseases including diabetes.

The relationship runs both ways, which is the part worth understanding — and this is the best-evidenced of all the mouth-and-body links:

If you have diabetes you are more susceptible to periodontal disease
Periodontal disease makes it harder to control your blood sugar
Moderate to severe periodontal disease may raise blood sugar and decrease the effects of insulin, increasing your risk of diabetic complications

Treating the gums is therefore part of managing the diabetes, not separate from it. Diabetes and dental health: the two-way street sets out the mechanisms and the treatment studies; diabetes and oral health covers the practical consequences in the chair.

Respiratory disease

The mouth can serve as a reservoir for bacteria that make their way into the lungs, leading to the development of bacterial pneumonia. This risk is greatest in older people and those with swallowing difficulties — I am in my late 60s — how can I keep my teeth in top condition? and oral health care for children with special needs both touch on the same population.

The association is well established. The evidence that improving mouth care prevents the pneumonia is weaker than it is usually reported to be, and this page previously overstated it. The current systematic review — Oral care measures for preventing nursing home-acquired pneumonia, Cochrane Database of Systematic Reviews 2022, Issue 11, CD012416 — covers six randomised trials in 6,244 nursing home residents in Japan, the United States and France. On the incidence of pneumonia, five trials in 5,018 residents gave "insufficient evidence of a difference" between professional oral care and ordinary self-administered care: low-certainty evidence, downgraded two levels for risk of bias and imprecision. The one positive finding concerned deaths rather than infections — from two trials totalling 454 residents, professional oral care may reduce pneumonia-associated mortality at 24 months, risk ratio 0.43 (95% CI 0.25 to 0.76), also low certainty, with 38 per cent of participants lost to follow-up in one of the two trials. All six trials were at high risk of bias, none was Australian, and none compared oral care with no oral care. The reviewers conclude that "the effect of professional oral care on preventing NHAP remains largely unclear".

So the respiratory link belongs with the associations flagged at the top of this page rather than alongside diabetes. That does not make assisted mouth care optional for someone who cannot manage their own — a neglected mouth reliably causes pain, infection, tooth loss and difficulty eating, which is reason enough on its own. It simply is not proof of pneumonia prevention, and it says nothing about healthy adults.

Cardiovascular disease

Many studies indicate an association between serious gum disease and cardiovascular disease.

The proposed mechanism: the increased bacteria associated with periodontal disease can form plaques in the arteries, which may break off and lodge in the heart or brain.

This is where care is most needed. The association is well documented, and the mechanism is plausible — but gum disease and heart disease share several of the same risk factors, including smoking, diabetes, age and socioeconomic disadvantage, and those confounders are difficult to separate out. Treating gum disease has not been shown to reduce heart attacks or strokes. The honest summary: an association exists, causation is unproven, and gum disease is worth treating on its own merits either way. Health problems linked to poor oral hygiene, the importance of dental hygiene — a window onto your overall health and how good oral hygiene can increase your lifespan cover the same territory, and deserve reading with the same caution.

On oral cancer specifically: poor oral hygiene is not an established cause, and the observed association is heavily confounded by smoking and alcohol — what are the causes, symptoms and treatment of mouth cancer?. What is worth acting on there is the two-week rule: any ulcer, lump, or red or white patch that has not healed in two weeks should be examined — oral cancer: signs, risk factors and how your dentist can help.

The big picture

The implications of oral health for total wellbeing are not only physical — influencing how we grow, look, speak, chew and taste — but psychological, influencing how we socialise, our social wellbeing, and how much enjoyment we get out of life.

That second half is rarely measured and often matters most to the person affected. The three layers of dental wellness and longevity and wellness and longevity develop that theme.

What to do

When managing your overall health, attend to your dental health through:

good nutrition — how do I prevent dental decay?
limiting the toxic substances you allow into your mouth, and thus into your body
good oral hygiene — selecting a toothpaste: fluoride or non-fluoride? and the benefits of fluoride
regular check-ups with your dentist and dental hygienist — how often should I go to the dentist? and dental cleans with our hygienists

Common questions

I have diabetes. What exactly should I be doing differently?

Four things, and the first is simply knowing that the relationship runs both ways.

Understand what the risk actually depends on. Diabetes Australia states that "the risk of developing periodontitis is greater in people with diabetes, particularly when blood glucose levels are not within the recommended range of 4-7 mmol/L" — and then the sentence that ought to be better known: "with optimum blood glucose management the risk of developing periodontitis is the same as for a person without diabetes." The risk is not conferred by having diabetes. It is conferred by glucose sitting outside range.

Know the signs so you can raise them early. Diabetes Australia lists the signs of periodontal disease as bleeding from the gums, bad breath, sensitive teeth, loose teeth and recession of the gums (or teeth appearing longer). None of those hurts much, which is exactly the problem.

Treat it as part of the diabetes management rather than a separate errand. Diabetes Australia reports "increasing evidence of a two-way relationship" — people with periodontitis show "poorer glycaemic status (higher level of HbA1C)" and a higher chance of developing prediabetes and diabetes, and "professional periodontal treatment has been shown to create a mild improvement in blood glucose levels". It is careful about the size of that effect: the improvement in the studies "lasted for only a short three-month period of time", with longer-term studies ongoing. So this is a real but modest benefit, and it is one more reason to treat the gums rather than the whole reason.

Act while it is still reversible. Diabetes Australia's most important sentence for anyone weighing whether to bother is about the supporting tissue destroyed by periodontitis: "these changes are irreversible." Gingivitis is reversible. Periodontitis is not — treatment stops it progressing rather than rebuilding what has gone.

Practically: tell your dentist you have diabetes and what your recent HbA1c was, tell whoever manages the diabetes that you are having periodontal treatment, and ask whether a shorter recall interval is appropriate. Diabetes Australia also notes the relationships differ between type 1 and type 2. See Diabetes and oral health and Periodontists.

My gums bleed when I brush, but nothing hurts. Is that really a problem?

Yes — and the absence of pain is the reason it becomes one.

Bleeding is the sign, not the disease. Gums that bleed when brushed or flossed are inflamed, and inflammation is the body responding to plaque sitting at the gum line. The Australian Dental Association's position is direct about what is driving it: "tooth decay (dental caries) and gum disease (periodontal disease) are two of the most common diseases experienced by Australians. Plaque is the primary cause of both diseases."

The instinct to stop cleaning the area that bleeds is the one to resist. Stopping lets the plaque mature undisturbed, which is precisely what allows gingivitis to progress. Cleaning it properly usually settles the bleeding within a week or two. If it does not, that is the signal to be seen rather than to try harder.

Why it matters that it is painless. Gingivitis is reversible. The next stage is not: Diabetes Australia's description of the tissue changes in periodontitis is that "these changes are irreversible". So the window in which the cheap, simple response works is the window in which nothing hurts. By the time a tooth is loose or a gum is receding, the response is longer, more expensive and less complete.

The other signs worth reporting, from the same source, are bad breath, sensitive teeth, loose teeth and gums that have receded so the teeth look longer. Any of those is worth mentioning at your next appointment rather than waiting to be asked.

See Bleeding Gums, What is gum disease? and When do you need deeper cleaning?.

Does mouthwash actually do anything, or is it marketing?

It does something. It just does not do the thing most people buy it for.

The Australian Dental Association's oral health promotion policy, most recently amended by the ADA Board on 24 October 2025, draws the distinction cleanly by putting mouthrinse in one list and not the other.

The main oral hygiene strategies, in the ADA's own words, are: "brushing for two minutes twice a day; using an age-appropriate fluoride toothpaste; clean between teeth once a day using floss or interdental brushes; and visit a dental professional for regular check-ups and professional cleaning." Mouthrinse is not on that list.

The proven aids to oral hygiene, separately listed, are: "toothbrush or denture brush; fluoridated toothpaste; interdental aids including floss & interdental brushes; sugar-free chewing gum; mouthrinse." Mouthrinse is on that one.

So the ADA's position is that mouthwash is a proven aid and not a main strategy — an addition to brushing and interdental cleaning, never a substitute for either. It is worth noting the company it keeps in that second list: sugar-free chewing gum. Useful, not central.

The ADA's one-sentence summary of what is essential does not mention it at all: "brushing, cleaning between teeth, and seeing a dental professional regularly are essential for good oral health."

What that means in practice. If you use a rinse, use it at a different time from brushing rather than immediately after, so it does not wash away the fluoride the toothpaste just delivered. And if you are using one because your gums bleed or your breath is bad, treat that as a reason to be examined rather than a problem solved — a rinse can mask a symptom that has a cause worth finding. See The truth and myths about mouthwashes.

How much dental disease is there really? Am I unusual?

No — and the national figures are more sobering than most people expect.

The Australian Institute of Health and Welfare reports that dental conditions caused 88,600 potentially preventable hospital admissions in Australia in 2023–24, at a rate of 3.3 per 1,000 population. A potentially preventable hospitalisation is defined as one that timely care outside hospital could have avoided. The rate has risen from its 2019–20 low of 2.6 per 1,000.

A 2023 systematic review of Australian studies puts that in proportion: dental-related hospitalisations "account for 10% of total potentially preventable hospitalisations and 22% of PPH due to acute conditions", making dental conditions the second highest cause overall.

Cost is a substantial part of why. A submission to the Senate inquiry into private health insurance cited an Australian Institute of Health and Welfare survey finding that nearly a third of people aged 5 or older (32%) avoided or delayed visiting a dentist due to cost, and noted that with no national dental fee schedule, patients "can go to multiple dentists and receive conflicting diagnoses and widely varying quotes for unpredictable dental fees".

The reason to put those numbers on a page about wellbeing is not to alarm anyone. It is that dental disease is the most common preventable thing on this page, and the one where delay converts most reliably into cost. If cost is what is keeping you away, say so at the first appointment — a staged plan that treats the worst thing first is a normal conversation, not an awkward one. See Price Guide and Payment Plans.

If I only changed one thing, what would make the most difference?

Change how often sugar reaches your teeth, rather than how much you eat in total.

The World Health Organization is unambiguous that "the consumption of free sugars in foods and beverages is the most common risk factor for dental caries", and recommends limiting free sugars to "less than 10% of total energy intake — and ideally to less than 5%". The Australian Dental Association translates the 5% figure into "no more than 6 teaspoons (24 grams) of free sugar per day". Free sugars include everything added by a manufacturer, cook or consumer, plus the sugars naturally present in honey, syrups and fruit juices — which is why juice counts and a smoothie counts.

But the mechanism is what makes frequency the lever worth pulling. WHO describes plaque converting free sugars "into acids that destroy the tooth over time"; saliva then neutralises the acid and the surface re-hardens. Each separate exposure starts that cycle again. Six sips across an afternoon is six acid cycles; the same drink finished with lunch is one. You can change that without eating less.

WHO names the other two ingredients of prevention alongside it, and they are the ordinary ones: adequate fluoride exposure, and removal of plaque by toothbrushing with a fluoride toothpaste containing 1000–1500 ppm. The ADA's four main strategies say the same thing in a form you can act on tonight: two minutes twice a day, an age-appropriate fluoride toothpaste, cleaning between the teeth once a day, and regular professional check-ups and cleaning.

If you want a second change, make it the interdental one. It is the step most often skipped and the one that reaches the surfaces a brush cannot. See Is flossing really that important? and Sugar: what does it do to your teeth?.

Practical details

Written by Dr Yasmin Coulthard (DEN0001023302), Registered Dentist, General Registration, at Smile Solutions. The clinical team is listed by name, and registration can be verified on the AHPRA register.

Smile Solutions, Level 1, 220 Collins Street, Manchester Unity Building, Melbourne VIC 3000 — getting here. Phone 13 13 96, contact us, or theteam@smilesolutions.com.au. Monday–Friday 8.00am–6.00pm, Saturday 8.30am–1.30pm, Sunday by appointment. Fee ranges are in the price guide.

Published 27 May 2013. General information only; it does not replace advice from your treating practitioner or doctor. Statements attributed to Diabetes Australia, the Australian Dental Association, the World Health Organization, Cochrane and the Australian Institute of Health and Welfare are those organisations' published positions and figures, not Smile Solutions data, and all change over time.

Smile Solutions trades under ABN 28 193 514 103.