Oral cancer: signs, risk factors and how your dentist can help

Why this one is different

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 Peter Alldritt, Chair of the ADA’s Oral Health Committee, has described it in summary as an insidious, aggressive disease with a five-year survival rate of only about 50 per cent, which often goes undetected until it is at an advanced stage.

Those two facts belong together. The survival figure is poor largely because of the detection problem, not because the disease is untreatable. Oral cancer found early has a far better outlook than oral cancer found late — and the reason it is so often found late is that its early signs are painless and easy to dismiss.

That reading is supported independently. A December 2024 review in the Australian Journal of General Practice states that oral cancer has a relatively low five-year survival rate, at around 50 per cent, “mostly due to diagnostic delays” — the same number, and the same explanation for it, from a peer-reviewed source rather than a professional association.

One qualification on any survival figure you read. They vary a great deal with how the disease is grouped, which years are covered and which measure is used. Cancer Council Victoria, for example, reports five-year relative survival for the broader oral and oropharyngeal grouping in Victoria rising from 61 per cent in 1983–1987 to 75 per cent in 2018–2022. That is a different population and a different measure from the roughly 50 per cent figure for oral cancer specifically, and the two are not interchangeable. The point both make is the same one: stage at diagnosis is what moves the number.

That makes this one of the few conditions where reading a symptom list actually changes outcomes. Oral cancer: how your dentist helps with early detection and what are the causes, symptoms and treatment of mouth cancer? cover the same ground from different angles.

How many people, and how long the delay lasts

The 2024 review puts the national scale at an estimated 5,189 Australians expected to be diagnosed with head and neck cancer in 2022. Oral Health Victoria, reporting on the Dental Health Services Victoria screening program, gives an estimated 2,642 cases of lip and oral cancers in 2022, within more than 4,000 new head, neck and lip cancer cases a year nationally — and expects the figure to rise.

The delay has been quantified too. An Australian study cited in the 2024 review found an average diagnostic delay of approximately four months between symptom onset and the initial histological diagnosis. That four months is not one person’s procrastination. It accumulates across noticing the change, deciding it matters, presenting, referral, biopsy and result — and the first stretch of it is the only part a patient controls.

Signs and symptoms

The recurring word across that list is persistence. Almost every item describes something ordinary — an ulcer, a sore throat, a hoarse voice — that has failed to resolve when it should have.

Anything in the mouth that has not healed in three weeks should be examined. That threshold exists because ordinary trauma and infection resolve well inside it.

A note on the number. Three weeks is the ADA threshold quoted here; many clinicians and cancer bodies use a more conservative two weeks. The two are not in conflict — they are the same rule set at slightly different levels of caution. If an ulcer, lump, or red or white patch has not healed in two weeks, that is a reasonable point to have it looked at, and three weeks is the outer limit rather than a target. Nothing is lost by going early.

The 2024 review lands in the same place and explains the mechanism. 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 why the list above matters. The usual prompt to see a dentist is pain, and this condition does not supply one early on.

Three signs that are not on most lists

The review’s own summary of common signs and symptoms adds items worth carrying across, because each has an obvious innocent explanation that gets reached for first:

An unexplained lump in the neck. Not in the mouth at all, and easily attributed to a passing infection.

Unexplained tooth mobility. A tooth that has loosened without gum disease to account for it. Periodontal (gum) disease explains most loose adult teeth; a loose tooth with healthy gums around it does not fit that explanation.

An extraction site that has not healed. A socket still open weeks after a tooth came out is a reason to have the area looked at, rather than to wait it out.

The items most often ignored from the original list:

A change in the voice, or a sore throat that will not clear, which people attribute to a lingering cold for months.

A denture that has stopped fitting, which is assumed to be the denture’s problem rather than a change in the tissue underneath it. See 5 things you should know about your new dentures and my denture is broken — what should I do? for the ordinary denture problems, which are far more common.

Who it affects

Oral cancer can affect anyone, from young adults through to the elderly.

It can occur on:

Registry data puts numbers against that list. Of oral and oropharyngeal cancers diagnosed in Victoria in 2023, Cancer Council Victoria reports the tongue as the most common site at 22 per cent, followed by the oropharynx at 19.7 per cent and the lip at 15.7 per cent — then the larynx (10.4 per cent), salivary glands (7.34 per cent), other parts of the mouth (7.01 per cent), the gum (4.81 per cent) and the floor of the mouth (2.77 per cent). About nine in ten start in the moist lining of the mouth, nose or throat, and 85.9 per cent of tumours across 2014 to 2023 were squamous cell carcinomas.

The median age at diagnosis in Victoria in 2023 was 64 in men and 67 in women, and 883 of the 1,226 diagnoses — 72 per cent — were in men.

That range matters, because several of those sites are not visible when you look in a mirror. The floor of the mouth, the sides and underside of the tongue, and the back of the throat are all areas a dentist examines and you cannot — and they are among the more common sites. The 2024 review is more specific again: it names the lateral margins of the tongue and the floor of the mouth as the highest-risk sites. Between them, the tongue and the floor of the mouth account for close to a quarter of diagnoses, and neither is somewhere you can inspect yourself. It is one reason a check-up is not only about teeth, and why tongue scraping habits are no substitute for someone looking properly.

The risk factors, and what to do about them

Oral cancer is caused by a variety of lifestyle risks, many of which are part of ordinary Australian life. In Dr Alldritt’s summary, smoking, alcohol, poor diet, excess sun exposure and poor oral hygiene all increase risk — and simple lifestyle changes make a substantial difference.

The ADA’s advice:

Risk Action
Alcohol Limit intake
Smoking Quit
Sun exposure Avoid prolonged exposure and wear a lip balm with SPF protection
Diet Eat fresh fruit and vegetables every day
Oral hygiene Maintain good oral hygiene

The lip balm item is the one worth acting on today. Lip cancer is strongly associated with cumulative sun exposure, the lower lip takes direct sun at almost every angle, and most people who apply sunscreen carefully to their face never cover their lips. An SPF lip balm is a trivial habit against a real risk — and on the registry figures above, the lip is the third most common site, at 15.7 per cent.

On smoking and alcohol: each raises risk independently, and together they compound rather than simply adding. Reducing either helps; reducing both helps disproportionately. Tobacco and alcohol are among the best-established causal risk factors for this disease — this is not one of the weaker mouth-and-body associations. The ADA takes the same position in its diet policy, which states that long-term, high alcohol consumption — particularly in association with tobacco, including e-cigarettes — should be avoided as it significantly increases the risk of oral cancer.

A risk factor missing from most Australian lists

The 2024 review 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 is worth raising with your dentist directly if it is part of your household, because it will rarely be asked about.

The same review also describes an emerging subgroup of non-smoking, non-drinking, middle-aged women presenting with tongue cancers as a concerning trend. The practical reading: avoiding tobacco and alcohol lowers risk substantially and is the single most useful thing on this page — but it does not put you outside the group in which this occurs. A persistent change in the mouth deserves the same two-week look either way.

On age, the sources set the line in slightly different places. The ADA material puts most cases in people over 40; the 2024 review recommends risk-associated screening from 45 years, especially in men; the Victorian median at diagnosis is in the mid-sixties. These are markers along the same rising curve rather than competing claims.

Vaping is a genuinely open question. E-cigarettes have been available for far less time than the decades of follow-up that established the tobacco link, so the long-term cancer evidence simply does not exist yet — which is not the same as evidence of safety. The effects of vaping on your oral health and are e-cigarettes bad for my teeth? set out what is currently known about the oral effects.

On the diet and hygiene rows: how does your diet affect your teeth?, six foods to avoid for healthy teeth, what is the ideal daily routine for oral hygiene?, is flossing really that important? and when do you need deeper cleaning?. Note that the hygiene association is weaker and less well understood than the tobacco and alcohol ones — it is a sensible thing to do for many reasons, and it should not be oversold as cancer prevention. The 2024 review frames the same item differently, listing limited access to dental care among the risk factors rather than hygiene itself, which is a meaningfully different claim.

Daffodil Day: raising awareness of dental dangers sets this in the wider cancer-awareness context.

How your dentist helps

Dentists are trained to examine the mouth and neck for abnormalities, and this happens as part of a routine check-up — usually before you have noticed it beginning. Understanding your treatment describes what a comprehensive examination covers.

It requires very little equipment. The 2024 review describes the screening examination 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. There is no national screening program for oral cancer — the review notes there is limited evidence to justify a formalised population program of the kind that exists for cervical cancer — so it is examined opportunistically, at whatever appointment you happen to attend.

The examination covers the areas you cannot see yourself, and because your dentist records what they observe at each visit, they can identify what has changed since last time.

That comparison is what makes early detection work. Many normal mouths contain patches, marks and asymmetries that are entirely benign. The significant question is usually not “is this abnormal?” but “is this new, or has it changed?” — which requires a record, and a clinician who has seen your mouth before. What causes white spots on teeth? is a reminder of how many ordinary explanations exist for things that look alarming.

It is another argument for regular check-ups with the same practice, quite apart from your teeth — is it important to have a family dentist?, what makes a truly great dentist? and 5 questions you’ve always wanted to ask your dentist. A hygienist visit between check-ups puts another set of eyes on the same tissue.

If you have a symptom from the list above that has persisted for more than three weeks, have it examined. Most such symptoms turn out to be benign. The examination costs very little, and this is a condition where the difference between early and late detection is measured in survival. If it is painful or worsening quickly, do not wait at all — emergency dentistry.

Common questions

What actually happens in an oral cancer screening?

Less than most people expect. It is an examination, not a procedure — nothing is cut, injected or removed.

The December 2024 Australian Journal of General Practice review describes it as “a comprehensive oral cavity examination with readily available equipment, including gloves, a mouth mirror, a tongue depressor and a torch”. The areas covered are set out in the same paper: the face, jaw, chin and neck from the outside, then the lips, the lining of the cheeks and lips, the attached gum, the tongue, the floor of the mouth and the hard and soft palate.

In practice that means someone looks at, and feels, the outside of your jaw and neck; then asks you to put your tongue out, moves it from side to side with gauze or a depressor so the edges and underside can be seen, lifts it to look at the floor of the mouth, and pulls the cheeks and lips away from the teeth to see the lining behind them. The tongue-handling is the part patients remember, and it is there for a reason: the lateral margins of the tongue and the floor of the mouth are named in the review as the highest-risk sites, and neither can be examined properly while the tongue is sitting still in the middle of the mouth.

It is not uncomfortable for most people, though the tongue-holding can provoke a gag reflex. If that is a problem for you, say so at the start — it can be done in short stages rather than one long look. See understanding your treatment for what else a comprehensive examination covers.

Can I check my own mouth, and what am I looking for?

You can, and it is worth doing — but be clear about what a self-check can and cannot achieve.

What it cannot do is inspect the high-risk sites. The sides and underside of the tongue and the floor of the mouth are extremely difficult to see on yourself, and they are where the review says to look hardest. A self-check is not a substitute for an examination and never becomes one.

What it can do is notice change, which is the thing that actually matters. Pull your lips out and look at the lining behind them. Look along the gums, at the roof of the mouth, and at the top of the tongue. Run your fingers down each side of your neck and under the jaw. Do it in the same light each time, because lighting changes appearance more than most people realise.

You are not looking for something that announces itself. You are looking for anything that was not there last month and has not gone: a sore or ulcer that has not healed, a red or white patch, a lump or thickened area, a rough patch that stays rough. And remember the point the review makes about early lesions being generally painless — “it doesn’t hurt, so it’s probably fine” is precisely the reasoning that produces a four-month delay.

I have had a white patch in my mouth for years. Is that the same as a new one?

This is the right question to ask, and it cannot be answered from a description.

Persistent red and white patches are on the list of changes the 2024 review says should prompt a screen — it names “red patches … or erythematous or speckled lesions” among the findings that warrant one. What the review does not do, and what nobody can do by looking, is sort the harmless patches from the ones that need watching. That sorting is the reason to have it examined rather than a reason not to.

A long-standing patch is not automatically reassuring, and it is not automatically alarming either. What changes the picture is change: a patch that has grown, thickened, developed a red or speckled area, become rough, or started to bleed or feel sore is different from the patch you have had since you can remember.

The practical step is to get it on the record. If it has been in your mouth for years and has never been examined, have it looked at once and documented properly, so that everyone afterwards is comparing against something. If it has already been examined, note the date, and go back sooner than planned if it changes.

A dentist has told me a spot is “probably nothing”. What should I do?

Most of the time that judgement is right, because most spots are nothing. The useful move is not to seek a different opinion straight away, but to make the judgement checkable.

Ask three things. First, that it is recorded — described, measured or photographed — so the next examination is comparing like with like. This is the whole basis of the approach described above: the significant question is usually not whether something looks abnormal but whether it is new, or has changed. A record is what makes that answerable.

Second, ask when it should be reviewed, and put that date in your calendar rather than leaving it to the next routine visit.

Third, ask what would change the plan — what you should watch for that would mean coming back before the review date rather than waiting.

If the spot changes, or if it is still there at the review, say so plainly and ask whether it now warrants referral. A patient who can say “this was 4 mm in March and it is larger now” has given the examination something no amount of equipment supplies. Seeking a second opinion is also entirely reasonable and nobody should take offence at it.

My GP looked in my mouth. Is that enough?

A GP examination is a real examination, and the 2024 review is explicitly about making more of them happen. It states that this type of screening “can be conducted by GPs and dental professionals”, and the whole purpose of the paper is to support GPs in doing it — an e-learning module, Oral Cancer: Prevention, early detection and referral, was launched on the RACGP training website in November 2023 for exactly that reason.

The reasoning behind the push is a coverage problem, not a quality one. 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 — and an Australian study cited in the review found that, in the period before diagnosis, patients later diagnosed with oral cancer had visited their GP far more often than a dental practitioner. In other words, adding GPs reaches people that dentistry alone does not.

So the answer is: a GP check is worth having and is better than none. It is added to dental examination rather than substituted for it — a dentist is looking at the same tissue several times a year in the course of ordinary care, with a record of how it looked last time.

Do I need a separate appointment for this, and will it cost extra?

No separate appointment is needed. As this page sets out, the soft-tissue examination is part of a comprehensive dental check-up rather than a distinct service you book — the review describes exactly that, opportunistic screening carried out at whatever appointment a person happens to attend, because there is no national program to send anyone an invitation.

That is the practical consequence of there being no screening program: nobody will write to you about this. The check-up you were going to have anyway is the mechanism.

Fee ranges for examinations and other treatment are set out in the price guide, and the practice can confirm what applies to your appointment before it happens. If cost is the reason your check-ups have lapsed, say so rather than staying away — the AIHW found that nearly a third of Australians aged 5 or older (32 per cent) had avoided or delayed visiting a dentist because of cost, which makes it one of the most common reasons for the coverage gap above, and not an unusual thing to raise.

Related reading

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 2 March 2015. Statements and figures attributed to the Australian Dental Association and Dr Peter Alldritt are summarised from ADA material published at that date; survival figures vary by site, stage, grouping and period. The survival, screening, risk-factor, diagnostic-delay and examination statements attributed to a 2024 review 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. Victorian incidence, subsite, morphology and median-age figures are from Cancer Council Victoria, drawing on the Victorian Cancer Registry (2025). The 2022 lip-and-oral cancer estimate is from Oral Health Victoria. The cost-avoidance figure is from an Australian Institute of Health and Welfare survey (2013) quoted in a submission to the Australian Parliament on private health insurance and dental fees. Further information is available from the Cancer Council. General information only; it does not replace advice from your treating practitioner.

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