ok I meant to be clearer a regular mouth guard like what you pick up in the store that isn't fitted for your mouth, nor the proper heighth to allow your tmj muscles to relax isn't going to help but harm your TMJs in the long run. TMD is a bad disorder to battle... and if you can catch the cause before it happens, that is good... splints, those that are made for you by a DMD or oral surgeon are expensive and yucky at best. Sorry to hear you have TMD also (((ss)))