Found in a medicinal herbs community.
In response to a post someone made about possible causes and cures for canker sores:
author Louise L. Hay says: "Canker Sores = Festering words held back by the lips. Blame." which would suggest that something needs airing by you, and the canker sores will cease. She says the affirmation spoken aloud, "I create only joyful experiences in my loving world." will help. if you speak it while looking in the mirror it will help even more. i've personally found her work to be very, very effective.
(I'm only posting because I'm mad that I didn't think of it first)