What causes TMJ and TMD?
The temporomandibular joint opens and closes more often than any other joint you own, and it does it with a small disc riding between the jaw and the skull. When that disc, the muscles that drive it, or the neck underneath it stop working together, you get pain, clicking, locking and headaches, usually on one side. Dentists see the teeth, and a night guard protects them. It does not retrain the joint or the muscles. That part is physical therapy, and the jaw responds to it well.
Sustained clenching keeps the masseter and temporalis under load for hours, and muscle that never gets to rest becomes tender, tight and painful to chew with. You wake with a tired jaw and an ache in the temple. A guard stops your teeth wearing down, which matters, but it does nothing for the muscle. Dry needling and hands-on release take the tone out, then we work on what is driving the clenching.
That click is usually the disc slipping in and out of position as the jaw opens. On its own, a painless click is not an emergency. When it comes with pain, or when the jaw catches and will not open all the way, the mechanics need correcting. Treatment restores the way the jaw translates and rotates as it opens, and retrains the muscles that control the path so the disc is not fighting them.
The upper neck and the jaw share nerve supply, and they share posture. A head that sits forward changes the resting position of the jaw and the load on the joint. This is why jaw treatment that ignores the neck keeps failing, and why people with TMD so often have neck pain and headaches too. Your evaluation examines both, because treating one without the other leaves the problem half addressed.
Holding the mouth wide open for an extended appointment stretches the joint and the muscles further than they normally go, and some jaws do not settle afterward. Orthodontic changes shift how the teeth meet, which changes where the jaw rests. Neither is a reason to panic. Both respond to hands-on treatment of the joint and graded retraining of the muscles that open and close it.
Jaws carry stress. People hold the teeth lightly together all day without noticing, chew gum constantly, or bite a lip when concentrating. None of it feels like effort, and all of it keeps the joint loaded. Part of the plan is awareness work: where the tongue rests, where the teeth should sit, and what the jaw does when you are busy. It is unglamorous, and it changes symptoms quickly.
