Canker sores can be very painful and uncomfortable, sometimes making it difficult to eat.
Recently the food and drug administration approved a new medication that is used to treat canker sores. It is applied directly to the ulcer or sore, usually 4 times a day. The most frequent side effect was a stinging or a burning sensation when the medicine was applied. If the canker sore does not heal in 10 days it is recommended that the patient discuss this with his or her doctor. Some individuals are more prone to canker sores particular those whose immune system is not working properly.