One has to wonder what kind of dedication you need to have to your mobile phone, to have a Bluetooth microphone implanted in your teeth. This filling is made out of durable composite resin, and it needs a 2.2 mm in diameter and 1.7 mm deep hole. It works by picking up vibrations and sound from the mouth, and the end result is an excellent sound.
I got nothing against it, though the way it looks in the second pic, it would bother me to have it visible.
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