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What is a mouth ulcer?

Answered on 11th January 2016
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A mouth ulcer is a painful sore that appears mainly on the inside of the cheeks or lips although they can found elsewhere. They are most often white, red, yellow or grey in colour, and red and swollen around the inflamed edges. Mouth ulcers can cause discomfort when eating, drinking, and brushing teeth, although they are usually short lived and will clear up within a week or two.


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