There is no cure for canker sores but you may be able to reduce how often you get them by avoiding foods that irritate your mouth. Spicy foods, acidic foods like pickles and sauerkraut, and citrus fruits can cause irritation.
If you have canker sores, help ease discomfort by eating bland foods until your sores heal, such as:
low-fat milk and other dairy foods
cooked, canned and frozen vegetables
mashed potatoes (fortify by mixing in powdered milk to boost nutrition)
cooked or canned fruit, including applesauce
hot cereals like oatmeal and cream of wheat (make with milk instead of water to boost nutrition)
soft cooked and shredded chicken, beef and pork
creamy-style peanut butter
pudding and custard
scrambled or fried eggs
tofu
soup