If you ever wanted a cell phone permanently implanted in your tooth, you can start thinking about it now.  Too bad the "Do Not Disturb" button can be accidentally deactivated while you are sleeping.  Sounds like a nifty invention in just a bit of the wrong place...

From the article:   In November 2002, designers at the Royal College of Art in London made headlines after coming up with the world's first cell-phone implant. Their design involved a small chip that housed a receiver and a transducer. The receiver could pick up mobile phone signals, and the transducer could translate them into vibrations.

Once implanted in a person's molar, the transducer caused the tooth to vibrate in response to radio signals. The physical structure of the jaw carried the tooth's vibrations to the inner ear, where the user, and no one else, could perceive them as sound. The implant's designers held dramatic demonstrations of this principle using a vibrating wand. Participants confirmed that they could hear crystal clear voices through their teeth.