Assuming it's a canker sore (these are usually IN the mouth and can be caused by an irritant (braces, broken/ jagged tooth, acidic foods, maybe a weakened immune system) and not a cold sore (usually on the lip/ outside the mouth, and caused by a virus-- which makes them contagious so don't be kissing on anyone!).... I'd suggest avoiding acidic foods-- oranges, tomatoes etc. Or anything else that seems to irritate it. Spicy foods, alcohol, mouthwash. Canker sores usually clear up within a few days.
Ruth in Cookeville, TN Central Time Zone
Promise me you'll always remember: You're braver than you believe, and stronger than you seem, and smarter than you think - Christopher Robin to Pooh
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