Oh. A canker sore is an ulcer...
One thing I've noticed... if you are doing a lot of kissing the pressure against teeth can give cuts - or bruises which can infect and become ulcers. (Just a thought).
My personal cure for these is to put vegemite on them. Our local spread. While travelling (can't get vegemite outside AU) I found that vitamin C tablets work well, but it hurts a little on first contact. I doubt the vitamin bit does anything - I think that having the salt against it is what causes it to go. Put the table between the sore and your teeth/tongue whatever....
Mind you, it may not work.
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