I had one tooth that didn't look too good before treatment but I was able to keep it after the dentist did some filling on it. I had a thorough dental wash before the radiation to minimize the problem of tooth decay. Like Cathy, I still have all my teeth with me today although without sufficient saliva, they need extra care. I believe it is not really rare that patients don't lose any tooth. It is worth keeping the tooth unless the doctor feels it absolutely necessary to take it out but he needs to give sound reasons to support his decision.
Karen