cnet:
Mp3 playing retainer transmits music through your teeth:
Bone conduction audio, retainers, and shiny hip-hop teeth grills aren’t new inventions, but tech hacker Aisen Caro Chacin had the clever idea to put them all together.
The Play-A-Grill MP3 player prototype fits in your mouth like a retainer, shines on the outside like a precious metal rap grill, and plays music through bone conduction through your teeth.
Oh man, this would have made puberty just a touch cooler. Maybe.