I have been trying to figure this out for many years but have come up with nothing. Every ear plug I've tried only makes the dental drill sound louder. I had dental appointment this week & my body was actually shaking from the sound of the drill. I have never heard a drill like this. It wasn't shrill but a low sound that reminded me of someone drilling in concrete. A nightmare I can't get out of my head. My husband says to get over it & move on. I have another tooth that needs the same procedure & I can't bring myself to go back to dentist. I was off balance & could hardly walk after it was over. I know most of you will probably understand this. I don't think I could hear dentist instructions if I had music in my ears. Anyone have info on ear plugs that will work? Thanks for letting me rant.