While I find the idea of embedding any devices in your body very weird, this Bluetooth Microphone Dental Insert that utilizes Nano Electronics certainly makes sense for those who work at call centers or are just addicted to talking on the phone.
According to the distibuter Chinavision, "an extremely small microphone is packaged with solar panel and battery to provide the most portable unit to date. The durable composite resin filling is designed to fit in a hole 2.2mm in diameter and 1.7 mm deep and will pick up sound and vibrations from your mouth to produce incredibly clear sound."
The set is compatible with all Bluetooth-capable phones with Handsfree and Headset profiles.
Bluetooth in Your Tooth
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