Sat Nov 07 2009 20:33 Public Service Announcement: Susanna didn't know this, so maybe you don't either. You can treat canker sores with grapes or raisins. Cut the grape/raisin in half and put its internal organs against the sore. Hold it in place with your tongue for a couple minutes. The grape/raisin chemically cauterizes or coats the canker sore (I don't really know how it works, and Susanna doesn't want to experiment) so that it doesn't hurt. Then, you can eat the grape/raisin. It's nature's candy!