Canker sores

Wtf causes these horrible things? And what can I do to prevent them and make them heal faster?

I get one at least once a month, and it's goddamn annoying.

Canker sores cannot be cured, they can only be prevented and very easily prevented at that. Since you are to stupid even to do this simple task I suggest immediate suicide. Don't worry about saying goodbye or the mess that you cause, you have achieved nothing and are completely worthless and the longer you exist the more you leach from the economy so the quicker the better.