Thankfully my dentist was able to repair my tooth, and the breakage has not compromised the root filling, so I will not need to have the tooth removed. He also read the ingredients on my biotene toothpaste and spotted the fluoride which was listed as its chemical compound. He didn't think that I would still have problems if I needed an extraction, but if it does come to that I will make sure I discuss it with the radiology oncologist first. I took some documentation I found on the net about the possible complications of radiology and he read through them and said that I was probably past the stage where we needed to worry about most of the side effects. He is a very good dentist and I trust him, but the side effects of radiation therapy and the effect on future dental work are probably a specialist subject. I think I frightened myself by researching the subject on the net, and I found some scary photos of bone necro...something or other, after a tooth extraction.