How it works
Mix a teaspoon of baking soda into a half a cup of water and swish it in your mouth for 30 seconds, 3x a day until your canker sore pain subsides.
What you'll need
I recently had a very painful canker sore and found this suggestion on a forum online. I tried it, and it helped relieve some of the stinging acidity of the sore immediately. It also helped speed up the overall healing process. The reason is supposed to be because baking soda is alkaline, but I didn't research that further. I will be using this tip again in the future, though!