Canker sores are usually found on the inner cheeks, gums or lips and occasionally, the tongue. They usually heal without scarring in 10 - 14 days. Canker sores are likely to recur. The exact cause is not known. There is no evidence that they are contagious.
Women are twice as likely to have canker sores as men.
Nothing will stop canker sores from occurring but there are things that can be done to relieve the discomfort and to prevent an infection in the area, during the 3-4 days when the sores are likely to be painful. Keep The Area Clean A mixtures of hydrogen peroxide diluted with water to half-strength and one teaspoon each of salt and baking soda to four ounces of water. These should be used as rinses or gargles four times a day. Avoid acidic foods that may irritate the sores. Neither vitamins nor special foods help the condition unless a specific deficiency exists.