Some people have told me that they have never had a canker sore. I hate those people. I currently have one on the underside of my tongue toward the back. It's causing unpredictable, sharp, incredibly strong pains that last a number of seconds. It would be a bit easier to deal with if I didn't have to eat or talk. Ibuprofen: fail. Acetaminophen: fail. I'll try something else tomorrow.