Mouth ulcer. Basically just a small open wound in your mouth that hurts like hell.

Running for exercise and picking up trash you find along the way. It's good for the body, mind, soul, and environment! Started in Sweden but is making its way to the U. S.

A canker sore is a sore on the inside of your mouth that you typically can't ignore, It suck ass

The most painful fucking thing your mouth can ever experience

A person so annoying it's painful.