Two-way radio clipped to molar is set to boost battlefield communications The latest US military radio clips neatly on your tooth. For real. Couple this with Quantum computers and this will make Firefox (Clint Eastwood) - look old school!
I recently had a play with current active ear defenders fitted with a bone microphone. (Sad but monied air-soft mate.) Spooky stuff. Head next to an SDS drill boring concrete but could hear anyone talking completely clearly. The bone conductor mike was even weirder. Just barely whispering sent perfectly clear speech.
Not sure you'd consider it a "good" one ... unless of course it's the opposition that's performing the deed.
I may be too tired. I read that thread title as US Molar Pics. Was looking to see some quality American back teeth. LOL.