I don't have a problem with tooth decay, but I have the worst dry mouth. In fact in the mornings my tongue will feel like sand paper and I will have to pull my teeth off my lips and I go through like 8 glasses of water a night. It is really awful. This has been happening for like the last year. My doctor says it is all my antibiotics. I don't agree though because it would happen when I was not on any antibiotics and now since I have been on IVs for a few months it has gotten better. So I think it is completely the lyme disease.