I had been using sensodyne for over a year bought from Costco. I had experienced dry mouth for about nine months. I had a few nightmares with The dry mouth. I visited doctor and did all kind of blood tests but could not find anything wrong. I began to suspect Sesodyne is the cause of it recently. I stopped using it a week ago it was getting better. I used it last night purposely and I woke up at 4 am because of dry mouth. I think I have found the root cause of my dry mouth problem.