What is Canker sore?
[[File:Aphtha2.jpg|thumb|The white spot is a cranker sore, on the lower lip]] A canker sore is a kind of [[mouth ulcer]]. These [[Ulcer|ulcers]] occur periodically, and heal completely. They are not [[contagious]]. The medical term for them is '''Aphthous stomatitis''' or '''recurrent aphthous stomatitis (RAS)'''. The condition is very common. It affects about 20% of the general population. It often starts in childhood or adolescence, and lasts for several years, before it slowly disappears. There is no cure, but there are [[drug]]s that are mostly given to manage [[pain]]. {{biology-stub}} [[Category:Symptoms]]