We're extremely proud of the material safety of our night guards. Through the years, we've tested possibly every type of night guard material to carefully curate what we think are the best and most advanced materials for a night guard. In fact, we go the extra mile (and cost), and directly source and import our materials from Germany. They're phthalate-free, BPA-free, latex-free, allergen-free. Depending on the type, our night guards are either a copolyester or TPU/EVA material, or a combination of both. The materials are both FDA approved and CE certified (according to European standards, which have higher consumer protection standards than those in the United States).