This is written to inform rather than to alarm, and the most important thing to say at the outset is that the overwhelming majority of changes people find in their mouths turn out to be entirely harmless. Knowing the early signs of mouth cancer is worth doing anyway, because when it is found early it is far more treatable, and dentists are the professionals best placed to spot it.
On this page
- The signs to know
- The three-week rule
- Where changes appear
- Risk factors, honestly
- What is almost certainly nothing
- What screening at your check-up involves
- If something is found
- In summary
The signs to know
The changes worth getting checked are:
- An ulcer or sore area that has not healed within three weeks
- Red or white patches in the mouth that persist
- A lump or thickened area, in the mouth, on the lip or in the neck
- An area that bleeds easily without an obvious cause
- Persistent unexplained numbness in the mouth or lip
- Difficulty swallowing that does not resolve
- Ongoing hoarseness or a change in your voice
- A sore throat on one side that persists
- Loose teeth with no obvious dental explanation
- A denture that has suddenly stopped fitting properly
None of these individually means very much. Most have innocent explanations. What matters is persistence.
The three-week rule
If there is one thing to take from this article, it is this: anything in your mouth that has not healed within three weeks should be examined.
Three weeks is long enough that ordinary ulcers, irritations and injuries will have resolved, and short enough that anything requiring attention is found early. Our post on a mouth ulcer that will not heal covers this in more detail.
Getting something checked is not expecting the worst. It is a five-minute appointment that almost always ends in reassurance.
Where changes appear
Mouth cancer can occur anywhere in the mouth, but some sites are more common than others: the sides and underside of the tongue, the floor of the mouth beneath the tongue, the lips, and the soft tissues at the back of the mouth and throat.
Notice that several of those are places you would never see without deliberately looking. The sides and underside of the tongue in particular are areas most people have never examined, which is why the monthly self-check in our post on how to check your mouth at home is worth the two minutes.
Risk factors, honestly
The main ones are well established:
- Smoking and tobacco use, the leading risk factor by a considerable margin. Our post on whether vaping is better than smoking covers the comparison, and our page on smoking cessation explains the support available.
- Alcohol, particularly heavy use, and it multiplies risk considerably when combined with smoking.
- HPV, increasingly recognised, particularly for cancers towards the back of the mouth and throat, and notably in younger people who have never smoked.
- Sun exposure, for cancers of the lip.
- Age, with risk rising as we get older, though no age group is exempt.
- Diet, where a diet low in fruit and vegetables appears to raise risk.
Two balancing points. Having risk factors does not mean you will develop mouth cancer, and most people with them will not. And mouth cancer does occur in people with none of them, which is precisely why screening here covers every patient at every check-up rather than only those who appear higher risk.
What is almost certainly nothing
Plenty of normal features look alarming to someone examining their mouth closely for the first time:
- Large bumps at the back of the tongue, which are normal papillae
- Prominent veins under the tongue
- A thin white coating on the tongue, which our post on tongue cleaning explains
- Small bony lumps on the palate or inside the lower jaw, which are common and harmless
- An ulcer where you bit your cheek, which should heal within a fortnight
- A ridged line inside your cheeks, often from clenching
If you are unsure whether something is normal, ask at your next appointment rather than worrying for months.
What screening at your check-up involves
It happens at every check-up here, for every patient, and most people barely notice it.
The soft tissues of your mouth are examined under good light: cheeks, lips, gums, the roof and floor of the mouth, and your tongue including its sides and underside. Your jaw and neck are then gently felt for any swelling in the glands.
It takes moments, causes no discomfort, and requires no instruments beyond a mirror and a light. Our page on mouth cancer screening explains it in full, and our page on dental check-ups covers where it sits within the appointment.
A dentist who has examined your mouth many times over the years also knows what your normal looks like, which is exactly what makes change noticeable.
If something is found
Calm and clarity first. You will be told exactly what has been seen and what it most likely is, and the great majority of findings prove entirely harmless: ulcers, friction marks, benign patches.
Some areas are simply monitored and re-checked after a set interval, which is a normal precaution rather than a cause for alarm.
Where a change genuinely warrants specialist assessment, an urgent hospital referral is made promptly and you will be told what to expect. Screening does not diagnose; its job is making sure the right eyes see the right things quickly.
The NHS page on mouth cancer has further information on symptoms and treatment.
In summary
The early signs to know are a non-healing ulcer, persistent red or white patches, lumps, unexplained numbness, and lasting hoarseness or difficulty swallowing. The three-week rule is the one to remember. Most findings are harmless, screening happens at every check-up here, and early detection makes an enormous difference.
If something in your mouth has been there longer than three weeks, please ring us on 01255 422506 rather than waiting for your next appointment. Our post on why gums recede covers another change worth having assessed.
This article is general information rather than personal dental advice. Every mouth is different, so please speak to your dentist about your own teeth.
