Lars (Nyc, Ny) on 12/07/2011:
I have proven over the years that when I have been "irregular" (constipated) - within a day or two non-mouth-bite related canker sores will surface. I believe this is due to build-up of toxins in the body from inability to eliminate them due to the reason I wrote above.
The toxins seem to breakout in one of the softest tissues in the body - inside the mouth.
Next time you have a break-out of canker sores, take a stool-softener or some other method to induce bowel movements... I have never heard anyone else state that constipation=canker sores, but if my advice helps you, please post your experience.
I hope this helps everyone.