BOIL AND BITE - Our 3 mm thick mouth guard easily molds to your teeth for a comfortable fit. Simply pour boiling water into a cup, wash your mouthpiece, and place it in the water for 35 seconds. Remove from the hot water with tongs, then bite into the mouthguard and suck in air through clenched teeth for 30 seconds. Once molded, run it under cold water to solidify your custom fit mouthguard. Focus on being the best at your game with Damage Control. Protect your jaw in lacrosse, boxing, roller derby, hockey, basketball, BJJ or weight lifting. It's suitable for any contact sports you play!