I have had extreme dry mouth side having radiation treatments for tonsil cancer on 2007. I am doing biotin products, practicing good oral hygiene, and am taking medications to help dry mouth. However, because i have constant burning mouth syndrome and post shingles neuropathy I need to take pain medications which cause dry mouth. I have fungal infections and now have facial rashes due to mouth bacteria. Does anyone out there have something new they've discovered for this problem which is not real expensive.