The information sheet says it will rot your teeth. I want to keep mine so after paying 75.00 with my co- pay l dropped them off at a drug return drop at cvs. Waisted my money. My pain management doctor didn't tell me any of this he just wanted to give me more drugs, get paid and see his next patient. He is almost like these facilities that hand out drugs to anyone who will pay him. But since I have chronic pain due to a bad neck surgery I have to keep seeing him. A lot of doctors in my area are not prescribing narcotics anymore and I have been on a Fentanyl patch for my pain for four years now. I'm lowering the dose because it's effecting my liver. And a host of other illnesses I'm dealing with right now. I have a Mayo clinic appointment this month to evaluate my liver because my GI doctor can't do anything further to help me. I have unexplained weight loss, insomnia, anxiety disorder, GI problems, and my endocrinologist is testing my adrenal glands to see if they are being affected also.