A canker sore is a painful, open sore inside the mouth that is often white and surrounded by red skin. The pain starts out as a tingling or burning sensation that quickly develops into a sore, but luckily it will diminish in seven to 10 days.
To soothe the pain, put 2 teaspoons of sage in a cup of hot water; let steep for about 10 minutes. Add 1/2 teaspoon lemon juice. Gargle with the warm solution. Once again, the concoction might sting the canker sore, but beauty is worth the pain.