I have experimented with professional level bone conduction hearing aids for single sided deafness. My big takeaway is that in order to get usable sound you need a lot of pressure on the skin; otherwise the tissue filters out the high frequencies. And sufficient pressure is very uncomfortable. The only successful bone conduction devices seem to be ones that directly couple to the skull; the BAHA is actually connected to a post surgically drilled into the skull. A promising new device used a wireless transducer worn on a tooth in the mouth, but the company went out of business.
I do like the idea of receiving sound through the tooth like the tin foil hat crowd who receive radio stations in their teeth. Surprised it isn’t yet more popular for covert use like replacing those fbi agent earpieces. Or maybe it is and they are being covert.
