I used to quite a few years ago, when I was at my most stressed. I noticed it myself when I awoke in the middle of the night and my jaw was working on its own, making this horrible sound. It happened enough that the right-side row of my teeth appear flatter than the left-side row of my teeth, but thankfully I haven't noticed any further damage in all of these years. However, It did prompt me to try to live as stress-free as I can.