Why Do We Get Canker Sores?

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A canker sore is an ulcer on the mucous membrane inside your mouth. The medical terms for canker sores are aphthous stomatitis, ulcerative stomatitis, or aphthae.

Recurrent canker sores are one of the most common inflammatory conditions of the mouth, afflicting about 20 percent of the general population. There may be a genetic predisposition for canker sores.

It is not known what causes canker sores in all patients, although more than one cause is likely even for individual patients. Attempts to...

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