The first thing you should do is request a refund from your dentist if you've already paid. Burned lips and open sores are totally unacceptable and dangerous. Until consumers stand up and realize this isn't normal and demand their money back, dentists are not going to question this product and its source. Zoom isn't going to give you your money back. I requested a refund from my dentist and got it. It will also tell you something about your dentist.