Jim
Go to any pharmacy, or health food store and buy some Lysine. You'll find it in the vitamin section. Take at least 1000 mg's daily. Your problem should go away within a week. Keep this vitamin handy. Anytime you feel a burning sensation that another canker sore is coming start your heavy intake of this vitamin. Since you apparently have strong tendancy to have this problem it probably wouldn't hurt to take it regularly. Ask your health food store specialist to confirm this. Good Luck