A Answers (2)
Canker sores are a common form of mouth sores that affect about one out of five people. Canker sores occur in women more often than men. They may occur at any age but usually first appear between the ages of 10 and 40. Canker sores can run in families. They may be linked to problems with the body's immune (defense) system. The sores also may occur after a mouth injury due to dental work, aggressive tooth cleaning, or biting the tongue or cheek.
American Dental Association answeredCanker sores are a fairly common mouth sore. They may return frequently and may be only one canker sore or several. They are not contagious and usually go away on their own within a week.