The aqualung comfo-bite mouthpiece is a patented product by aqua lung, and was designed to reduce jaw fatigue, and allows you to enjoy the diving experience longer. this is a game changing item for anyone suffering from tmj or just who finds their jaw sore during and/or after diving. additionally, because it does not require the diver to bite down with the molars, the mouth pieces tend to last longer, not getting “chewed through” nearly as quickly as traditional mouthpieces. designed by an engineer who used a retainer for his teeth, he incorporated the same design into the comfo-bite.