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?