Clearly they would have to be punished. By being forced to drink Bud Light for the rest of their lives.
It's not something funny.
I use a product from Rembrandt brand which is made specifically for people who get canker sores. No SLS, and has some other stuff in it.
It doesn't foam up when you brush so it requires more effort to clean your teeth, but it seems to have reduced the frequency of sores forming.