A mouthpiece has an upper guard having a first mold layer and a first shell layer. The upper guard has an arcuate shape between a first end on a first side and a second end on a second side. The mouthpiece also has a lower guard having a second mold layer and a second shell layer. The lower guard has arcuate shape between a third end on a third side and a fourth end on a fourth side. Connectors couple the ends of the upper guard to the ends of the lower guard. The first and second mold layer are a flexible material and the first and second shell layer are a relatively rigid material.
