I have had TMJ now for years. I had headaches, jaw soreness, jaw stiffness and the clicking and popping. I did have a night guard made by an oral surgeon many years ago, and used it for quite a while, but then stopped using it because it was hard to sleep with it in my mouth. I went without it for years. I know that I clench and grind my teeth at night because when I wake up, my jaw is so sore. I finally asked my dentist if she could make me a new one. It feels tight in my mouth (probably because it is new) but I am trying to be faithful and use it every night. It is still hard to sleep with it, but I am determined to continue using it to see if it will help me. I already have little indentations on it from my bottom teeth clenching it (It is for my top teeth). I know that I really need it and hoping for some improvement soon! Mary Ann from MA