I am a little more than 2.5 years post rad. My dentist made fluoride trays and prescribed Gel Kam fluoride gel that I use for about 10-20 mins every day. I also use the Prevident 5000 tooth paste for dry mouth, also prescription. I use the Biotene products as well. In spite of all this extra special care, I have had several teeth crack or chip off, and I have needed one root canal. I also have a cavity under a bridge that is just waiting for the dentist to decide what to do about it. The lack of saliva causes so many problems with tooth decay so it is very important to do all that you can to help prevent it. I suspect that I will eventually need HBO treatments for teeth that may need to be pulled in the future. Radiation side effects are the pits!