My tinnitus turned on around age 7 or 8. I believe mine was hereditary, not from any loud noises. I used to listen to my transistor radio to mask it. As another guitar player, I was especially careful of my hearing, wearing protection when attending loud concerts (never when playing in bands, unfortunately). I've adapted to it. Being a dentist hasn't seemed to make it worse. I feel pretty lucky not to be bothered much by it although I wonder what total silence sounds like.