Mouth cancer is rising, and it is being caught too late

Dental panels reach for this because it is the point where a routine check-up becomes a matter of life and death, and because it links three things they want you to hold at once: a disease process, a public health trend, and the access story that runs through the rest of this blog.

Here is the version worth holding. The number of cases is rising, the stage at which they are found has barely improved, and the person most likely to spot an early lesion is a dentist looking at a patient who came in about something else. Anything that reduces routine dental attendance therefore has a cancer consequence, and that is the connection a strong candidate makes.

Most are squamous cell carcinomas arising from the lining of the mouth, tongue, floor of mouth, or the oropharynx behind it. The classic risk factors are tobacco in any form, including chewed betel quid and paan, and alcohol, and their combination is more than additive — a heavy drinker who also smokes carries a risk far above the sum of the two exposures. Poor diet, and sun exposure for lip cancers, add to it.

The change of the past two decades is human papillomavirus. HPV-positive oropharyngeal cancers — typically tonsil and base of tongue — have risen sharply and now account for a large share of that subsite. The patient is often younger, often a never-smoker, and the tumour responds better to treatment, so the survival picture differs from the classic smoking-and-drinking cancer. It is also the reason the HPV vaccination programme, extended to boys in the UK in 2019, matters to dentistry: a vaccine given at twelve is expected to reduce a cancer diagnosed at fifty.

An early lesion is usually painless. A red or white patch, a persistent ulcer, an area that does not heal — none of it hurts, so nobody presents. By the time there is pain, a lump in the neck, difficulty swallowing or a loose tooth with no dental cause, the disease is often advanced, and the difference in survival between early and late stage is stark.

That leaves opportunistic detection. A dentist examining a mouth for a check-up looks at the soft tissues as a matter of routine: the tongue including its lateral borders and undersurface, the floor of the mouth, the buccal mucosa, the palate, and the neck for lymph nodes. It takes a minute, it happens whether or not the patient has any complaint, and it is the single most reliable route to an early diagnosis. Which is why the collapse in NHS dental access is a cancer story: a patient who has not seen a dentist for five years has had five years of missed examinations, and the people least able to get an appointment are disproportionately those with the highest risk-factor burden.

The referral pathway matters too. A suspicious lesion should be referred on an urgent suspected-cancer pathway, and the safe rule for anything that has not resolved in three weeks is to refer rather than review again.

The levers divide the way public health levers usually do. Population measures — tobacco control, minimum unit pricing for alcohol in Scotland and Wales, HPV vaccination — reach everyone including the people who never see a clinician, and they work slowly. Targeted measures — brief advice at the chairside, referral to smoking cessation, opportunistic screening — reach only the people who attend, which is the population least likely to be at highest risk.

That asymmetry is the honest problem, and it is worth stating plainly rather than resolving. A dentist can deliver very good brief advice to the patients in the chair and still be systematically absent from the lives of those most likely to develop the disease. The answer is not to abandon chairside prevention but to say that it cannot substitute for the population measures, and that dental access is itself a prevention policy.

This arrives in three shapes. The direct one: "What would you look for in a mouth cancer screening?" The scenario one: a patient mentions an ulcer that has been there a month. And the disguised one — "Why does it matter that people cannot get an NHS dentist?"

For the direct question, walk the examination in order. For the scenario, refer rather than review, and say why three weeks is the threshold. For the disguised question, use mouth cancer as the sharpest available answer.

Start with Cancer Research UK’s head and neck cancer statistics for the trend and the survival figures, then the Oral Health Foundation’s mouth cancer material for the screening and awareness side. NICE’s suspected cancer referral guidance gives you the referral thresholds in the wording a clinician would use.

Two pieces here sit beside this one. The dental contract and dental deserts is the access failure that removes the examination, and how a dentist is trained explains who is doing the looking. For the ethics framework, see our guide to the four pillars.