I've been using Biotine Dry Mouth Spray for several years now. My mouth is dry as the Sahara if I don't use it when I sleep. The Biotine moistens and moisturizes my mouth even with me being a mouth-breather and using a sleep apnea machine. My only complaint is that the sprayer doesn't work more often than not. The liquid goes all over (on the bottle, my fingers, my chest). It seems to have gotten worse lately.