I think a lot of it is diet too - high sugary foods, also saliva - since it generally helps with plaque (sp?)and finally where the rads is aimed... Oral cavity vs throat and esophagus. Though I must say they cooked my mouth but - I'm like you David - good hygiene - and tray use do make a difference. It's only been a little over 2 years for me but so far so good - I would plan on doing whatever you can to keep your teeth. Some people do get implants later but that requires a stable jaw... Etc..