The Pentagon has confirmed a $10 million contract with a company to provide a “molar mic,” a small device clipped to the molars at the back of the mouth that enables users to speak and listen without any visible microphone or earpiece. Incoming sound passes through the jaw bone and skull while outgoing sound is passed to a transmitter hidden elsewhere on the body. The “molar mic” has been used elsewhere, including testing for 14 months in Afghanistan. The CIA declined to comment on their usage of the technology, although its nonprofit investment arm did invest in the development of the technology.
Source: The Military Now Has Tooth Mics For Invisible, Hands-Free Radio Calls – Nextgov