Video at the link
Meet the Play-A-Grill. It’s the next evolution of both blinged-out mouth-wear and portable music.
Here’s how the Play-A-Grill works. First, insert the shiny, retainer-like device into your mouth. Then use a wire to connect your portable MP3 player to a vibrating motor and, finally, to the retainer. The vibrations run through your jawbone and become music you can hear in your head. You can skip back and forth to different songs by pressing your tongue against different parts of the retainer