I can totally relate to this. I am on three meds that all cause dry mouth and find myself always drinking as much water as I can (I am at times fluid restricted due to kidney issues) and using the special mouth wash, toothpaste and gum. My dentist claims that doing so will help keep my mouth from drying out to the point of damaging my oral health. So far my teeth are looking and feeling good and I have been dealing with this dry mouth side effect for a few years now.