The Comfo-Bite Mouthpiece, patented by Aqua Lung, reduces jaw fatigue, and allows you to enjoy the diving experience longer. Designed by an engineer who used a retainer for his teeth, he incorporated the same design into the Comfo-Bite. The mouthpiece allows the diver to completely loosen the bite on the regulator mouthpiece and allow it to lightly rest in their mouth, making this the most comfortable mouthpiece available.