I'm 18 mos. from radiation (entire oral cavity - 66gy) - very dry, trismus - on evoxac, trental, nystatin (rinse w/biotene)- need to drink water all the time especialy if I eat anything - need to wash down food also to stop pain. I think drymouth is also the culprit with mouth tissue irritation - teeth with no saliva rough up tissue and then causes pain.