i have had really good luck using raw propolis. You're in Asheville, you can find it. It doesn't take much, it's strong stuff. It's like hash, kind of gummy and brittle when cold. Take some, roll it between your fingers to warm it up, take a small ball of it, and pack in on the tooth. Leave it there for as long as possible, sleep on it. I have staved off cavities for years with this technique, that, combined with avoiding white sugar will help. If you plug a hole, or cap a tooth with it, say once a week, it should keep you infection free. I've actually had it hault the cavities. you won't grow a new tooth, but you won't lose one or need a trip to the dentist either. It's really cheap stuff, and any beekeeper will have more than enough to spare.