LONDON (AP) _ Tired of losing your cell phone? Having other people listen in on your conversations? What about all the times you've had to turn it off at public events, or leave it behind while swimming? Two British inventors unveiled a prototype of a device Friday that could solve those problems. But there's a drawback _ your dentist would have to install it inside one of your molars. Unofficially known as the ``telephone tooth,'' the device would allow you to receive phone calls, listen to music, even connect to verbal sites on the Internet without anyone nearby hearing a...