In this Aug. 9, 2017 photo provided by Sonitus Technologies, an audio mouthpiece is clipped to on a user’s tooth in San Mateo, Calif. The mouthpiece, which can become the single point of contact for incoming and outgoing wireless audio communication, was designed with the help of funding from the U.S. Defense Department’s Defense Innovation Unit Experimental, which works with contractors to fund and develop solutions for the military’s toughest technology challenges. (Sonitus Technologies via AP)