Not sure exactly what you are experiencing, but it could also be TMJ, which is fairly common. When I talk in a quiet room, I always hear my jaw popping, though I've had the pain associated with TMJ as well- which makes it hard to open my mouth at all. This is a lockjaw syndrome that happens sometimes.
parasite cleanse will sometimes help rid people of symptoms (caused by clenching teeth and what not). Chiropractic works sometimes too. Might be good to bring this up with a professional(however you define that term) because we are all stabbing in the dark given the limited information we receive. I guess it doesn't really matter what it's called, but, it may help you in knowing how to deal with it once you know how other people have dealt with it before.