question: I have dry mouth that's causing my tooth to get root decay even though I throughly brush. I am on Lamictal 200 mg 3x gabapentim 800 mg 3x. Lorazepam 2mg 1-1/2. Notryptolinr 3x3 risperadol 3grams 1-2 x methylamphetamine 36x2. I have cut the last one down to one. Just got off Zoloft. What is causing these problems