03-20-2002, 05:27 PM
When I get tense or just concentrating really hard on something, I clench my jaw muscles. If I do it for too long, I get a popping sound like knuckles cracking when I open my jaw. It's subconcious and i don't even notice it until I hear that popping sound and the muscles are all tight.
![[Image: gargoyle.jpg]](http://groups.yahoo.com/group/Dentsigs/files/gargoyle.jpg)