Jim, according to my son's experience - some things worked for him for a while, and then they didn't but when he went back to them, they started working again. He tried the Oasis and Magic Mouthwash and Stoppers 4 dry Mouth and Biotene. It would seem to me that even if something doesn't work or only for a little while, it doesn't mean that it won't work again later on. David, you always made me feel better when I was helping my son through his recovery and you gave us both hope that things would get better - and they did!