Just a small correction--everyone else has given most of the list I would have made otherwise--if you need trays for flouride gel, you can go to a regular dentist to get those made, it doesn't need to be a dental oncologist though it is great if you can get to see one. Otherwise, it would be desirbale to find a dentist who knows about the effects of radiation on the mouth anyway, because you will need to have all your teeth in really good shape when you start radiation.