< b>Canker sore: A small ulcer crater in the lining of the mouth that is
often painful and very sensitive. Also known as an aphthous ulcer.
Canker sores are one of the most common problems that occur in the mouth. About
20% of the population (1 in 5 people) have canker sores at any given time. Canker
sores typically last for 10-14 days and they heal without leaving a scar.
The word "canker" comes from the Latin "cancer" for crab. (In Latin "cancer"
was once pronounced kanker from which came canker). Chronic ulcers might seem as
hard as a crab shell.
For a full article, see Canker sores (Aphthous ulcers).
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