I finished my IMRT in June '07 for left tonsil ca. I now have some decay on the most back tooth on the radiated side which had a root canal years ago and is also an anchor for a bridge. My DDS referred me to an oral surgeon and they both consulted with my RO. My DDS said that if I want to try and save the tooth, he will remove the bridge and try to fill the cavity. He says that the tooth, already being weak from a root canal, might not be strong enough to hold the bridge again. If the tooth cannot be saved, they recommend that I go for HBO Tx and have the tooth extracted. I asked about having implants and they advised against them. Why can some oral ca radiated patients have implants and others not?