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Mouth ulcers

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Introduction
Mouth ulcers are painful round or oval sores that form in the mouth, most often on the inside of the cheeks or lips.
Causes of mouth ulcers
Most minor, single mouth ulcers are caused by damage to the mouth, for example by accidentally biting the inside of your cheek while you are eating.
Diagnosing mouth ulcers
If you have a mild mouth ulcer, there is usually no need for you to see your GP or dentist because these ulcers will usually heal within a week or two.
Treating mouth ulcers
Most mouth ulcers don't require specific treatment, as they will usually heal on their own within 10-14 days.