I had all my metal fillings replaced years ago save one. The dentist at the time said that one was fairly small and in great shape and did not need any work.

I went into treatment with that one small filling. It did not interfere with the radiation field as I was getting some shots to the back of the throat (from the side) and the rest to the nodes. That radiation field hit the nodes first and then hit the tooth.

I also had a tongue block during treatment, which is a tongue depressor with a big chunk of foam on the end that I had to bite down on. This is meant to move my tongue out of some of the radiation field or something (I never understood that part). I did not have a tray because of the tongue block (too much)

The point here is that the worst of the Ulcers I got was right next to the filling. My RO said that the filling had lensed a small concentration of radiation into the tongue.

Kelly