My jaw locked open — is that an emergency?

Treat it as urgent. An open lock needs to be reduced by a clinician trained to do it, and the longer it stays out the harder and more uncomfortable the reduction becomes. Do not try to force it closed yourself.

My jaw used to click and now it does not, but it will not open fully. Is that better?

Usually not. Clicking that stops alongside reduced opening is the classic pattern for a disc that has stopped reducing — the noise disappeared because the disc is no longer going back into place. That combination is worth evaluating promptly.

Locked Jaw

A locked jaw is frightening in a way most jaw problems are not, because the loss of function is immediate and obvious. There are two distinct kinds, they have opposite mechanisms, and the difference matters a great deal for what happens next.

Closed lock: the jaw will not open

This is the more common of the two. The disc has slipped forward off the condyle and stopped returning to place, so the condyle runs into it instead of gliding under it. Opening typically stops around 20–30mm — roughly two fingers rather than three — and the jaw often deviates toward the affected side as it reaches the limit. Many people report that the joint used to click for months or years and then the clicking stopped, which is the point at which the disc stopped reducing.

Open lock: the jaw will not close

Much less common and far more alarming. The condyle has translated too far forward and cannot slide back, usually after a wide yawn, a long dental appointment, or a bite into something very large. The jaw sits open and the teeth will not meet. This needs prompt professional reduction — it is not something to force at home, because forcing it risks damaging the joint and the surrounding tissue.

What to do in the first days

For a closed lock, stop trying to force the jaw open. Move to soft food, keep the jaw within its comfortable range, apply moist heat to the muscles, and get it assessed quickly. Time matters here more than in most TMJ presentations: a disc that has been displaced for weeks is more recapturable than one that has been displaced for a year, and the joint adapts around a long-standing lock in ways that are harder to reverse.

How it is treated

Early closed lock is often managed with an orthotic designed to unload the joint and give the tissue room to settle, combined with manual therapy and controlled range work. Some discs reduce; many do not, and the realistic goal in those cases becomes a joint that functions comfortably at close to normal range rather than a disc restored to its original position. Both are acceptable outcomes and you should be told which one is being aimed at.

Common questions

My jaw locked open — is that an emergency?: Treat it as urgent. An open lock needs to be reduced by a clinician trained to do it, and the longer it stays out the harder and more uncomfortable the reduction becomes. Do not try to force it closed yourself.
My jaw used to click and now it does not, but it will not open fully. Is that better?: Usually not. Clicking that stops alongside reduced opening is the classic pattern for a disc that has stopped reducing — the noise disappeared because the disc is no longer going back into place. That combination is worth evaluating promptly.

Not sure where to start?

Request a virtual consultation with Dr. Samadian. In-person visits are by appointment in New York.

Book An Appointment

Related Care

All TMJ Conditions