How can I stop the pain of canker sores and get rid of it?

Colgate Soothe and Seal is the best over the counter remedy for canker sores (aka apthus ulcers) This product has medication in it that will soothe the discomfort of the sore and it creates a seal over it. With the seal covering it you won't irritate it more. The hardest thing with canker sores is continuing irritating it and this seal prevents it. Feel better!