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Mouth cancer: early signs you should not ignore

Published and checked against the sources below: October 2026

Mouth cancer can start as a sore, lump or patch that does not go away. See a dentist or doctor if you have a mouth ulcer that lasts more than three weeks, or any unexplained lump or patch.

Signs to look for

Most of these have harmless causes, but any change that lasts should be checked.

What raises the risk

What to do

Book a check with a dentist or doctor if you notice a change that lasts more than three weeks. Dentists check the mouth for these signs at regular check-ups. Early diagnosis improves the chance of successful treatment.

Yuktii Smile Scan can give a simple note on photos of a sore or spot on the lips and tongue, but it is not a diagnosis and cannot rule out cancer.

Quick answers

Is a mouth ulcer that lasts weeks cancer?

Usually not, but an ulcer that lasts more than three weeks should always be examined.

Can a dentist check for mouth cancer?

Yes. Dentists look for early signs during a routine check-up.

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