Yes! I stopped using fluoride toothpaste/mouth wash and they went away!

Restrictive diet I used to think it was my food allergies as well and went in a very restrictive diet trying to control them. And nothing I did seemed to get rid of them I lived on kanka. Then I got off fluoride and can enjoy more food without getting them. I still have to be careful and not overindulge but if I accidentally or just treat myself to a little bit of something I'm allergic to I won't get canker sores

Putting milk of magnesia on them helps it heal faster