For years I clenched my jaw and grind my teeth mostly at night to the point of damaging my teeth. I wore a guard and then didn't now again back at it due to jaw pain. The guard helps a bit mainly from damage when asleep and seems to protect my jaw joints.
My point being even if my jaw is totally relaxed there is a hum from the muscles in my jaw. It's like a 60Hz hum musicians hear from AC interference in speakers. I have to wonder if it's part of the constant noise I hear in my ears.
I also get BPPV too it's severe sudden vertigo it may be related to my clench and tinnitus. It's just random no clue what causes it. I can't even walk and have to lay down and not even close my eyes just pick a spot and stare. I had to do that for 12 hours one time my worst time.