Oral cancer: how your dentist helps with early detection

A condition most people know little about

The Australian Dental Association describes oral cancer as one of the least understood conditions among the general public — while around three Australians are diagnosed with it every day.

Dr Karin Alexander, then ADA Federal President, noted that the incidence of oral cancers is increasing worldwide, and that smoking tobacco and drinking alcohol are well known significant causal factors — with the risk increasing where someone both smokes and drinks.

That combination point is worth pausing on. The two risks together do not simply add; they compound, which is why the combination is singled out. These are causal factors in the proper sense, established over decades — unlike several of the looser “mouth and body” associations that circulate. Oral cancer: signs, risk factors and how your dentist can help and what are the causes, symptoms and treatment of mouth cancer? cover the same subject in more detail.

What the Australian numbers look like

“Three a day” is a national headline. The published registry data fills it in, and it is worth reading because it changes where you look.

Cancer Council Victoria reports that 1,226 Victorians were diagnosed with oral and oropharyngeal cancer in 2023 — 883 men and 343 women, or 72 per cent and 28 per cent of diagnoses. That works out at a rate of 23 per 100,000 men and 8 per 100,000 women, and it made oral and oropharyngeal cancer the sixth most commonly diagnosed cancer in Victoria that year, accounting for 3.1 per cent of all cancer diagnoses and 2.6 per cent of cancer deaths. The median age at diagnosis was 64 in men and 67 in women.

Where these cancers start is the part that matters for an examination. In 2023 the most common subsites were the tongue (22 per cent), the oropharynx (19.7 per cent) and the lip (15.7 per cent), with the floor of the mouth a further 2.77 per cent. About nine in ten begin in the moist lining of the mouth, nose or throat — the squamous epithelium — and 85.9 per cent of tumours diagnosed across 2014 to 2023 were squamous cell carcinomas.

One trend is worth noting rather than alarming over. For Victorian women, the age-standardised incidence rate rose by an average of 3.2 per cent a year between 2017 and 2023, while the change for men across 2008 to 2023 was 0.1 per cent a year and was not statistically significant. Long-run mortality fell for both. (Source: Cancer Council Victoria, drawing on the Victorian Cancer Registry, 2025.)

Risk factors

Alongside tobacco and alcohol:

A poor diet low in fruits and vegetables. How does your diet affect your teeth? and six foods to avoid for healthy teeth cover the dental side of the same advice.

Sun exposure, which has been linked to cancer of the lip. This is the one people forget — the lower lip receives direct sun in a way the rest of the face does not, and it is rarely covered by sunscreen. An SPF lip balm is the cheapest risk reduction on this page. The registry figures above put lip at 15.7 per cent of subsites, which is not a rounding error.

Age — oral cancer most often occurs in people over 40. I am in my late 60s — how can I keep my teeth in top condition? covers the rest of the changes that come with age.

On vaping: the evidence base is much younger than the tobacco one. E-cigarettes have not been in use long enough for the kind of long-term follow-up that established the tobacco link, so there is no settled answer on oral cancer risk yet — which is not the same as a clean bill of health. The effects of vaping on your oral health and are e-cigarettes bad for my teeth? set out what is known about the shorter-term oral effects, which are real enough on their own. Daffodil Day: raising awareness of dental dangers covers the wider awareness picture.

Two things the older risk lists leave out

A December 2024 review in the Australian Journal of General Practice names areca (betel) nut chewing alongside tobacco and alcohol among the established risk factors for oral cancer — and notes that the practice, common in parts of South Asia, is a growing trend in Australia, which the authors suggest may affect diagnosis rates in future. It appears on very few consumer risk lists, and it is worth raising directly if it is part of your household.

The same review flags something that cuts against the stereotype. It describes an emerging subgroup of non-smoking, non-drinking, middle-aged women presenting with tongue cancers as concerning. The practical reading of that: not smoking and not drinking lowers your risk substantially; it does not remove you from the picture, and a persistent change in the mouth deserves the same attention either way.

On age, the sources draw the line at slightly different points. The ADA figure quoted above is over 40. The 2024 review sets risk-associated screening at 45 years or over, especially in men, and the Victorian registry’s median age at diagnosis is in the mid-sixties. These are different markers on the same rising curve rather than a disagreement about the facts.

How your dentist helps

Dentists are specifically trained to perform a comprehensive examination of the neck and mouth to detect abnormalities.

This is part of a routine check-up, and most patients are unaware it is happening — the examination of the tongue, floor of the mouth, cheeks, palate and neck that occurs before anyone looks at your teeth. Understanding your treatment sets out what a full examination covers, and how often should I go to the dentist? how frequently it should happen.

Reducing risk factors and having regular check-ups improves the chance that a cancer is picked up early, and that adverse consequences are avoided or reduced.

There is no national screening program for this one

That is worth knowing, because it determines who is doing the looking. Australia runs national population screening programs for breast, bowel and cervical cancer, and more recently for lung cancer in a defined high-risk group (Cancer Council Australia). There is no equivalent program for oral cancer. The 2024 AJGP review states plainly that there is, to date, limited evidence to implement a formalised population oral cancer screening program such as the one for cervical cancer — so detection rests on a thorough medical history and a visual examination taken during whatever appointment a person happens to attend.

That examination needs very little equipment. The review describes it as a comprehensive oral cavity examination using gloves, a mouth mirror, a tongue depressor and a torch, covering the face, jaw, chin and neck as well as the lips, cheeks, gums, tongue, floor of the mouth and palate. The highest-risk sites are named as the lateral margins of the tongue and the floor of the mouth — which is why a dentist lifts and moves your tongue rather than simply looking at it, and why the parts you can check in a mirror are not the parts that matter most.

There is a coverage gap sitting behind all of this. In 2020–21 only 48 per cent of Australians had seen a dental professional in the previous 12 months, while in 2021–22 almost 90 per cent received at least one Medicare-subsidised service. An Australian study cited in the same review found that in the asymptomatic phase before diagnosis, patients with newly diagnosed oral cancer had visited their GP far more often than they had visited a dental practitioner. That is the reasoning behind training GPs to screen — and, from the other side, a reason not to let your own check-up lapse.

Why continuity matters so much

This is the most useful idea in the ADA’s advice, and it is easy to skip past.

Your dentist keeps accurate, contemporaneous records of what they observe at each examination, which means they can quickly identify changes in the mucosa of the mouth.

Seeing the same dentist allows comparisons to be made between findings, so abnormalities are spotted and dealt with quickly.

As Dr Alexander put it, most people have a regular medical GP, and dentistry is no different — seeing the same dentist means they get to know you and your mouth.

The practical significance: a great deal of oral pathology is identified by change rather than appearance. Many normal mouths contain marks, patches and asymmetries that are entirely benign. What matters is whether something is new, or has grown, or has changed colour since last time — and that judgement requires a baseline. A dentist seeing you for the first time has no baseline. See is it important to have a family dentist?, what makes a truly great dentist? and finding a dentist online in Australia. A hygienist appointment is another set of eyes on the same tissue between check-ups.

The three-week rule

The ADA recommends that anyone who notices a change to the inside of their cheeks or gums lasting more than three weeks should seek advice from a dentist immediately.

Three weeks is the threshold because ordinary trauma — a bitten cheek, an ulcer, an irritation from a sharp filling — resolves well within that time. Something that does not resolve is behaving differently, and warrants a look. The cause of mouth ulcers and their usual treatments covers the ordinary kind, and why do I bite my cheek after a filling? one of the common innocent explanations.

Many clinicians and cancer bodies set the same rule at two weeks rather than three. The difference is caution, not disagreement. The practical version: any ulcer, lump, or red or white patch that has not healed in two weeks is worth having looked at, and three weeks is the outer limit rather than a target. Going early costs you one appointment.

The 2024 AJGP review gives that same rule with its reason attached. It states that initial lesions of oral cancer are generally painless, and that anyone reporting an unexplained or non-healing change or symptom in the mouth for more than two to three weeks — a persistent ulcer, red patches, lumps, a sore throat, or speckled lesions — should have an oral cancer screen.

Painless is the operative word in that sentence. Almost everything that sends a person to a dentist is pain, and this is a condition whose early signs do not supply any. That is a substantial part of why it is so often found late.

The cost of the delay has been measured. An Australian study cited in the same review found an average diagnostic delay of approximately four months between symptom onset and the initial histological diagnosis. Four months is not one person’s procrastination — it is the accumulated delay across noticing, deciding, presenting, referral, biopsy and result. The first two or three weeks of it are the part you control.

Signs and symptoms to be aware of

A sore, irritation, lump or thick patch in the mouth, lip or throat
A white or red patch in the mouth — distinct from the everyday causes of white marks on teeth, which are on the tooth rather than the soft tissue
A feeling that something is caught in the throat
Difficulty chewing or swallowing
Difficulty moving the jaw or tongue — far more often jaw joint trouble or TMD, but worth distinguishing
Numbness in the tongue or other areas of the mouth
Swelling of the jaw that causes dentures to fit poorly or become uncomfortable
Pain in one ear without hearing loss

The 2024 review’s own list overlaps with that and adds two items worth carrying across, because they are easy to attribute to something else: an unexplained lump in the neck, and unexplained tooth mobility or an extraction site that has not healed. A tooth that has become loose without gum disease to explain it, or a socket still open weeks after a tooth came out, is a reason to have the area examined rather than waited out.

Two of the original list deserve emphasis because they do not look like mouth problems.

A denture that has stopped fitting is often assumed to be the denture’s fault. It can indicate a change in the underlying tissue, and it is a reason to have the mouth examined rather than simply having the denture adjusted. 5 things you should know about your new dentures and my denture is broken — what should I do? cover the ordinary denture problems.

Pain in one ear without hearing loss sends people to a GP, and can be referred pain from the mouth or throat. It is also, much more often, a toothache referring upwards or a TMJ problem.

None of these signs means cancer. All of them are far more often caused by something benign. They mean have it looked at, which is a two-minute examination against a condition where early detection changes the outcome substantially. If something is painful or worsening quickly, do not wait — emergency dentistry.

Further information is available from the Cancer Council.

Common questions

The dentist has found something. Does that mean I have cancer?

No — and it is worth being precise about what an examination can and cannot do. Looking at a lesion does not tell anyone whether it is cancer. It tells a clinician whether something is behaving unlike ordinary tissue, which is the trigger for finding out properly. A dental examination cannot rule oral cancer in, and it cannot rule it out either.

Finding out properly means a histological diagnosis: a sample of tissue examined under a microscope. The December 2024 Australian Journal of General Practice review measures diagnostic delay as the interval “between symptom onset and the initial histological diagnosis” — the microscope, not the appointment, is where the answer comes from. That step happens after referral, not in a general dental chair.

Oral Health Victoria describes the purpose of its own screening resource as supporting oral health professionals “to recognise and refer suspected oral cancers in early stages for faster investigation, diagnosis and treatment”. Recognise and refer is the whole of the dental role. Most referrals of this kind end with a benign result, which is exactly what you would expect given how common harmless marks and patches are.

If you are referred, three questions are worth asking before you leave: what the referral is for, how soon you should expect to be seen, and who to contact if you have not heard anything. See when do I need to see a dental specialist? and complex dental cases: what happens when multiple specialists need to collaborate.

Why does a few weeks of delay matter this much?

Because this is a condition where the stage at which it is found is doing most of the work, and it is very often found late.

The 2024 AJGP review states that, despite advances in diagnosis, treatment and management, oral cancer “has a relatively low five-year survival rate, at around 50%, mostly due to diagnostic delays”. Oral Health Victoria makes the same point from the other direction: low survival rates are “largely due to delayed presentation or diagnosis”.

Read those two sentences together and the reasoning becomes plain. The survival figure is not a fixed property of the disease — both sources attribute it substantially to when it is found rather than to what it is. That is not a promise about any individual, and nobody can give you one. It is the reason the two-to-three-week rule above is written the way it is.

The four-month average delay quoted earlier is made up of many small intervals — noticing, deciding it is probably nothing, waiting for it to settle, getting an appointment, referral, biopsy, result. Only the first few are yours. They are also, usually, the longest.

I have no natural teeth left. Is there any point in seeing a dentist?

Yes, and this is the group most likely to have stopped going.

The screening examination described in the 2024 review covers the lips, the lining of the cheeks and lips, the tongue, the floor of the mouth, the attached gum and the hard and soft palate — plus the face, jaw, chin and neck. None of that depends on having teeth. The highest-risk sites named in the same review, the lateral margins of the tongue and the floor of the mouth, are in every mouth regardless of what is left in it.

There is a second reason specific to denture wearers, and it is on the list above: a denture that has stopped fitting can reflect a change in the tissue underneath rather than a fault in the denture. A reline or an adjustment fixes the symptom. It does not examine the cause. See 5 things you should know about your new dentures and dentures.

Against that, only 48 per cent of Australians had seen a dental professional in the previous 12 months in 2020–21. Whatever is in your mouth, an annual soft-tissue examination is a short appointment.

How common is oral cancer in Australia, really?

Oral Health Victoria reports that in Australia there are more than 4,000 new cases of head, neck and lip cancers diagnosed every year, and that the majority of these are oral cancers. In 2022 there were an estimated 2,642 cases of lip and oral cancers, a figure the organisation expects to rise in the coming years.

Set beside the Victorian registry data earlier on this page — 1,226 Victorians diagnosed with oral and oropharyngeal cancer in 2023, the sixth most commonly diagnosed cancer in the state that year — the national picture is a condition that is uncommon in the sense that most people will never have it, and not rare in the sense that a dentist will never see one.

That is the right frame for a check-up. The examination is not looking for something exotic. It is looking for something that a busy practice does encounter.

If I stop smoking or cut down on alcohol, does my risk actually come down?

These are described in the sources as modifiable risk factors, and that word is doing real work — it distinguishes them from age, which you cannot change.

ADA Policy Statement 2.2.2 states that “Long term, high alcohol consumption and in particular in association with tobacco (including e-cigarettes) use should be avoided as it significantly increases the risk of oral cancer and other health issues.” The 2024 AJGP review lists tobacco use, alcohol consumption and areca (betel) nut chewing among the modifiable risk behaviours GPs should be giving advice about, and frames the advice as worth giving — which is only coherent if changing the behaviour changes something.

What the independent sources in front of us do not give is a figure for how far or how quickly risk falls after stopping, so we are not going to invent one. The honest answer is direction without a timetable: the risk is described as increasing with long-term exposure and with the combination of tobacco and alcohol, and the advice to reduce it is given by every body that writes on the subject. For help stopping, your GP and Quitline are the right starting points, not a dental practice.

One thing that does not change with stopping: if you have a history of tobacco, alcohol or betel nut use, the review puts you in the group for whom screening should be considered on a case-by-case basis — current or past users, in its words.

Do I need to ask for an oral cancer screening, or does it just happen?

Some of it happens anyway. A thorough check-up includes an examination of the soft tissues, and most patients never notice it as a distinct step.

But the 2024 review is specific about who warrants a deliberate, risk-associated look: “Risk-associated screening should be done on a case-by-case basis for patients aged 45 years or over and for those who are current or past substance users (eg alcohol, tobacco or betel nut/quid).” Case-by-case means someone has to make a judgement, and that judgement is better made with the information in front of it.

So say it out loud. Tell the practice if you smoke or have smoked, how much you drink, whether you chew betel nut or quid, and whether anyone in your family has had a head and neck cancer. Then say what you have noticed, when you first noticed it, and whether it has changed — that last one is the single most useful sentence you can offer, because so much of this assessment turns on change rather than appearance.

If you have a specific spot you are worried about, point at it. A patient who says “this has been here about a month and it used to be smaller” has done more for the examination than any amount of equipment.

Practical details

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. The clinical team is listed by name, and fee ranges are in the price guide.

Published 11 September 2014. Statements and figures attributed to the Australian Dental Association and Dr Karin Alexander are summarised from ADA material published at that date. The Victorian incidence, subsite, morphology and median-age figures are from Cancer Council Victoria, drawing on the Victorian Cancer Registry (2025). The screening, risk-factor, diagnostic-delay and examination statements are from Saraswat et al., “Promoting oral cancer screening by general practitioners in Australia”, Australian Journal of General Practice, volume 53 issue 12, December 2024. The national case counts are from Oral Health Victoria. General information only; it does not replace advice from your treating practitioner. If you have a symptom that concerns you, seek assessment rather than reassurance from a web page.

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