If medicine doesn't work to unlock jaw, what do you think I should do?

So i'm taking just 2 mg. of valium for my jaw because I have tmj problems and it's been locked. But the medicine isn't really working. I'm going to get a night guard soon because I grind my teeth during night and that's what causes it. Will that help me? Or do you think the dentist would tell me to take more of the medicine?