Oil for mouth ulcer

Mouth ulcer, or canker sore according to Wikipedia, has no easy cure. But not mentioned in any article I know of is that you can simply apply any edible oil to the ulcer to greatly ease the pain, and in fact expedite recovery, rather like putting a bandaid on wound. I think the way this works is oil covers the ulcer to prevent water (mostly saliva) to get to the spot. Since you would move your tongue onto the ulcer accidentally or intentionally during the day, covering the ulcer with oil at night before you sleep is the best.

According to Dr. Weil, if the ulcer is a cold sore, you may also want to avoid chocolate, beer, grain cereals, nuts, etc.