Abstract: A mouthpiece and method for reducing snoring comprise a mouthpiece body of a thermoplastic material having a shape generally complementary to the person's dental arch, including a posterior end having two spaced apart members positioned toward the back of the person's dental arch when properly worn, and an anterior end having an airway opening therethrough, the anterior end positioned when properly worn to support the person's lips spaced apart so that air flows through the airway opening; and a substantially rigid, removable protective mold of a thermostable material, said protective mold complementary to said mouthpiece body and separably engaged therewith so that the mold protects at least lower and lateral peripheries of the mouthpiece body.