221 Second Stage Pneumatically balanced second stage Ergonomic A.V.S. (Adjustable Venturi System) Dive/Pre-Dive Switch Patented Orthodontic Mouthpiece with High Density Bite Tabs
221 Second Stage Pneumatically balanced second stage Ergonomic A.V.S. (Adjustable Venturi System) Dive/Pre-Dive Switch Patented Orthodontic Mouthpiece with High Density Bite Tabs