go to wallgreenes or oscoe drid, spemd 2 bucks and buy a botle of whichhazle. yea that is right it is listed with that name, dab it on your finger and then on the gum, cold sore or cankersore, pimples too. put it on every 2 hours or so. it will cure a cankersore in 2 days, actually cols sores and gum swelling also.