| 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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