What is a Canker Sore?

A canker sore is the common term for an aphthous ulcer, a lesion inside the mouth that looks like a shallow, round, white or gray spot, often with some redness around the edge. When there are multiple ulcers, we call them “aphthae.” These lesions are painful and can make it uncomfortable to eat, drink or chew. Canker sores are not contagious.

Canker sores usually last up to 2 weeks and heal on their own.

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