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TMJ / TMD

Jaw Pain: Is It Your Muscles or Your Joint?

By Douglas Sandquist, DDS

Almost nobody arrives saying they have a temporomandibular disorder. They arrive with headaches at the temples, a jaw that clicks or catches, pain that has been blamed on stress for years, or teeth that are wearing down faster than they should.

The first useful thing to say is that TMJ is not a diagnosis. It is a joint, the temporomandibular joint, and everybody has two of them. TMD, temporomandibular disorder, is the name for things going wrong in that system. That distinction matters more than it sounds, because what gets lumped together as TMJ is at least three different problems with three different answers.

Three problems wearing one name

The research literature splits them the same way we do in the chair:

  • Muscle pain (myogenous). The muscles that close your jaw are overloaded and sore. This is the most common version and, encouragingly, the most treatable.
  • Joint pain (arthrogenous). The problem is inside the joint itself: a displaced disc, inflammation, or degenerative change in the bone.
  • Both at once (mixed). Common, and the reason a single treatment aimed at one of them often disappoints.

Treating the wrong one is why so many people arrive having already tried something that did not work.

How we find out which one you have

This is the part worth being specific about, because a real workup is what separates a plan from a guess.

A proper hands-on TMJ exam comes first. We palpate the muscles to find which ones are actually sore, and we test whether the joints can be loaded. Loading the joint means applying pressure through it deliberately to see whether that reproduces your pain. A joint that loads comfortably is telling you something very different from one that does not, and no scan gives you that answer.

3D CBCT imaging shows us the bony architecture of the joint directly, rather than inferring it from the bite.

An MRI, on occasion. CBCT shows bone. When the question is soft tissue, most often the position and condition of the disc, an MRI is what actually answers it. We do not order one routinely, only when the answer would change the plan.

The trap in the imaging

Here is something we see constantly, and it is the reason we do not diagnose from a scan.

Degenerative joint disease is a common finding on CBCT, including in patients whose joints load comfortably and who have no joint pain at all.

Read that again, because a lot of unnecessary treatment starts by ignoring it. Finding degenerative change on a scan does not establish that the change is causing your symptoms. Joints adapt. Bone remodels. Plenty of people walk around with imaging findings that are not hurting them and never will.

If we image your joints and find degenerative change, the next question is not what to do about the scan. It is whether that joint is actually the source of what brought you in. The exam answers that. The scan informs it.

Why the distinction decides everything

Muscle pain and joint pain respond to different things.

Muscle-origin pain often responds well to work aimed at the muscles. Joint-origin problems need a different conversation, sometimes including imaging we would not otherwise order, and occasionally a referral.

Telling them apart is not a formality before treatment. It is the treatment decision.

Treatment is a ladder, and most people do not climb far

Once we have a diagnosis, the goal is the simplest thing that solves the problem.

For some patients, hands-on treatment is the entire answer. Buccal massage and physical therapy are enough on their own for a meaningful number of muscle-origin cases. No appliance, nothing to wear, nothing irreversible. Buccal massage has randomized trial evidence behind it specifically for muscle-origin jaw pain, and in our own patients results have ranged from useful temporary relief through to symptoms resolving.

Most commonly, we use orthotic therapy. An orthotic is a custom appliance that does two jobs at once. It lets overloaded muscles calm down, and then, as they do, it lets us find where your joints actually want to rest. Those two things happen in that order for a reason: a jaw held in a guarded position by sore muscles will not tell you the truth about where the joint is comfortable. You have to quiet the muscles before that question can even be asked.

In our experience an orthotic usually produces significant improvement. What happens next is the part nobody explains properly.

What the orthotic actually tells us

Say it works and you feel substantially better. That is a good outcome, and it is also a finding: it usually means your bite is not in the right place relative to your joints. The appliance is holding your jaw somewhere your own teeth do not allow it to sit.

So the next question is whether you can leave it out.

  • If you can go without it for longer and longer stretches and the symptoms stay away, that is the end of the story. A lot of people finish right here.
  • If you cannot, meaning symptoms return whenever the orthotic is out, then the bite itself has to be moved closer to where the orthotic has been holding it. In practice that means orthodontics, restorative work, surgery, or some combination of the three.

That is the point where irreversible treatment finally makes sense. Notice what it took to get there: a diagnosis, a reversible appliance, and a demonstrated response.

You are not being asked to accept braces or crowns on a theory about your bite. You are being asked to make permanent a jaw position that has already been shown to work for you.

And if the orthotic does not help, that is a result too. A patient who does not improve on a well-made orthotic is telling us the problem will not be solved by managing load, and that surgery or further intervention deserves a serious conversation. Either way the appliance earns its place, because every outcome it produces narrows what is left.

Being honest about the evidence

We are not going to oversell the appliance, because the published evidence on splints and occlusal treatment for TMD is genuinely weak.

The 2024 Cochrane review of occlusal interventions pulled together 57 trials and 2,846 participants, and judged only one of those studies to be at low risk of bias. Its verdict on every comparison it assessed was very low certainty. It could not establish that a stabilization splint reliably outperforms placebo, physical therapy, or several other treatments.

Singh BP et al. Occlusal interventions for managing temporomandibular disorders. Cochrane Database of Systematic Reviews. 2024;9:CD012850.

So why do we still use orthotics? Because the argument for one was never that it beats everything else in a trial. It is that it is reversible, removes no tooth structure, and produces information whichever way it goes. When the evidence cannot tell you which treatment is best, the sane move is to start with the one you can undo.

That is also why we do not begin by grinding down teeth, or with crowns or orthodontics aimed at a bite problem nobody has confirmed is the cause. Those are not reversible, and they should be the conclusion of a process rather than the opening move in one.

What else is often part of the picture

  • Clenching and grinding, which are usually tied to stress or sleep. Worth mentioning even when it feels unrelated to your teeth. It rarely is.
  • Daytime clenching, which people underestimate badly. A guard worn at night does nothing for the eight hours you spend braced at a desk.
  • How you breathe and swallow. Tongue posture and mouth breathing load the jaw muscles all day long. Myofunctional therapy addresses the habit rather than its consequences.
  • Wear on the teeth, which is often the most objective evidence available of what those muscles have been doing. Wear patterns tell a story about force, and sometimes about acid.

When it is not us

Some jaw pain is not dental. Nerve pain, some headache disorders, and inflammatory joint disease can all present as a sore jaw, and they are treated by other people. Part of a real workup is being able to say the problem is not ours, and to say it early rather than after a course of treatment that was never going to help.

One patient lived with a poor bite and periodontal disease for close to twenty years after a significant bite change from old dental work, and had struggled to find a team willing to take on a problem that size. See how that was finally resolved →

If your jaw hurts and nobody has explained why

That is the most common story we hear, and it usually means the diagnosis step got skipped. Call 702-734-0776 or tell us what is going on. More on how we treat TMJ and TMD here.

Common Questions

What is the difference between TMJ and TMD?

TMJ is the temporomandibular joint, the hinge connecting your jaw to your skull. Everyone has two. TMD, temporomandibular disorder, is the name for problems affecting that joint and the muscles around it. So TMJ is anatomy and TMD is the condition. Saying you have TMJ is a bit like saying you have knee. The distinction matters because TMD covers several different problems that need different treatments.

Is my jaw pain from the muscles or the joint?

That is the central question and it is answered by examination, not by guessing. We palpate the muscles to find which are genuinely sore, and we load the joints to see whether pressure through the joint reproduces your pain. Muscle-origin pain and joint-origin pain respond to very different treatments, so telling them apart is not a formality beforehand, it is the treatment decision itself.

Do I need a scan for jaw pain?

Sometimes. A 3D CBCT shows the bony architecture of the joint directly, which is useful when the exam raises a question about the joint. An MRI is different and shows soft tissue, most often the position and condition of the disc, and we order one only when the answer would change the plan. Neither replaces a hands-on exam, because no scan can tell you whether loading a joint reproduces your pain.

My scan showed degenerative joint disease. Is that what is causing my pain?

Not necessarily, and this is worth understanding before anyone treats you for it. Degenerative change is a common finding on CBCT, including in patients whose joints load comfortably and who have no joint pain at all. Joints adapt and bone remodels. Finding degeneration on a scan does not establish that it is the source of your symptoms. The examination determines that, and the scan informs it.

Do I definitely need an appliance?

No. For some patients buccal massage and physical therapy are enough on their own, particularly when the pain is coming from the muscles rather than the joint. That is the first rung of the ladder and a meaningful number of people never need to climb past it. We would rather find that out than fit an appliance by default.

What is an orthotic and how is it different from a night guard?

A night guard mainly protects teeth from grinding forces. An orthotic is aimed at the problem rather than the damage: it lets overloaded muscles calm down, and then, once they have, it lets us find where your joints actually want to rest. A jaw held guarded by sore muscles will not give an honest answer about that, so the sequence matters. It doubles as a diagnostic tool, and it is completely reversible.

What happens after orthotic therapy?

If the orthotic makes you substantially better, that is telling us your bite is probably not in the right place relative to your joints. The next test is whether you can leave the appliance out. If you can go without it for longer and longer stretches and stay comfortable, you are finished. If symptoms return every time it is out, the bite needs to be moved closer to where the orthotic has been holding your jaw, which means orthodontics, restorative work, surgery, or a combination. At that stage you are making permanent a position already shown to work for you, rather than acting on a theory.

What if the orthotic does not help?

Then it has still told us something important. In our experience an orthotic usually produces significant improvement, so a patient who does not improve on a well-made one is indicating that the problem will not be solved by managing load. That is when surgery or further intervention becomes a serious conversation rather than a guess. Learning it from a reversible appliance is far better than learning it after irreversible treatment.

Does a splint or orthotic actually work?

The honest answer is that the published evidence is weak. A 2024 Cochrane review of 57 trials and 2,846 participants rated the certainty of the evidence as very low across every comparison, and could not establish that a stabilization splint reliably beats placebo or physical therapy. We still use orthotics, but not on a claim of superiority. We use them because they are reversible, they remove no tooth structure, and they produce information whichever way they go.

Will I need orthodontics, crowns or surgery?

Only if the orthotic shows that you will. The sequence matters: if the appliance relieves your symptoms but you cannot manage without it, that indicates the bite has to be permanently moved toward the position the orthotic is holding, and orthodontics, restorative work or surgery is how that gets done. Plenty of people never reach that point. What we will not do is start there, because none of it is reversible.

Can jaw pain cause headaches?

Yes, and headaches at the temples are one of the more common ways muscle-origin TMD presents, because the temporalis muscle sits exactly there. It is also the reason jaw-related headaches often get treated everywhere except a dental chair. That said, not every headache is jaw related, and part of a proper workup is recognizing when the problem belongs to somebody else.