Jaw clicking when you open your mouth is almost always caused by a small disc inside your jaw joint slipping out of position and then snapping back into place. It’s extremely common, affecting roughly 30% of adults, and in many cases it’s painless and harmless. But understanding why it happens helps you figure out whether yours needs attention.
What’s Happening Inside the Joint
Your jaw connects to your skull through two joints called the temporomandibular joints (TMJs), one on each side. Between the ball of the jawbone and the socket of the skull sits a small, rubbery disc that acts as a cushion. When everything works properly, this disc glides smoothly as you open and close your mouth.
The click you hear happens when that disc has shifted slightly out of its normal resting position. As you open your mouth, the jawbone has to push past the displaced disc to complete its full range of motion. That moment of the disc popping back into place is the click. When you close your mouth, the disc slides off again, sometimes producing a second, softer click. Dentists call this “disc displacement with reduction,” meaning the disc wanders but returns to where it belongs during movement.
If the displacement is more significant, you might feel a brief catch or restriction before the click happens, almost like the jaw has to work harder to get past a speed bump. That momentary resistance is the disc temporarily blocking the jawbone’s path before it snaps back into alignment.
Why the Disc Slips in the First Place
In most cases, there’s no single obvious cause. The National Institute of Dental and Craniofacial Research notes that for many people, symptoms seem to start without clear reason. Current evidence points to a combination of factors rather than one trigger.
The most common contributors include:
- Clenching and grinding (bruxism): Chronic teeth grinding, especially during sleep, puts sustained pressure on the joint and can gradually shift the disc’s position.
- Stress and muscle tension: Psychological stress often translates into tightening of the jaw muscles, which changes how forces are distributed across the joint.
- Injury or trauma: A blow to the jaw, whiplash, or even prolonged dental work with the mouth held wide open can damage the joint or stretch the ligaments holding the disc in place.
- Habits: Frequent gum chewing, nail biting, or resting your chin on your hand can all overwork the joint over time.
- Genetics and pain sensitivity: Some people appear to be genetically predisposed to TMJ problems, and individual differences in pain perception influence whether mild disc displacement becomes symptomatic.
Women are affected at nearly twice the rate of men (about 37% versus 27%), though the reasons for this gap aren’t fully understood.
When Clicking Is Just Clicking
Painless clicking with no restriction in movement is very common and often doesn’t require treatment. Many people have a jaw that clicks for years without it ever progressing to anything more serious. If you can open your mouth fully, eat without discomfort, and the sound doesn’t come with pain, you’re likely dealing with a mild disc displacement that your body has adapted to.
That said, there are signs the problem may be getting worse. Pain around the joint or in the muscles of your cheek and temple, difficulty opening your mouth fully, a jaw that locks open or shut, headaches radiating from the jaw area, or ear pain without an ear infection all suggest the joint is under more stress than simple clicking implies. Joint sounds combined with muscle pain (the most commonly reported TMD symptom, affecting about 37% of those with disorders) deserve a closer look.
How It’s Diagnosed
Diagnosis is based primarily on a physical exam. A dentist or doctor will feel the joint just in front of your ear on both sides while you open and close your mouth, checking for tenderness, clicking, and whether the jaw tracks straight or shifts to one side. They’ll also press on the muscles around your jaw, temples, and neck to identify whether the problem is coming from the joint itself or the surrounding muscles.
Imaging usually isn’t needed for straightforward cases. When it is, a panoramic X-ray is the typical starting point. MRI provides the most detailed view of the disc and soft tissues but is generally reserved for cases where symptoms persist despite treatment, or when a dentist suspects the disc is no longer reducing (popping back into place) at all. Ultrasound is sometimes used as a lower-cost alternative.
Self-Care That Helps
Most jaw clicking responds well to changes you can make on your own. The goal is to reduce stress on the joint and give inflamed tissues time to calm down.
Start with your diet. Switch to softer foods and cut out anything that forces your jaw to work hard: chewy bread, tough meat, raw carrots, caramel, and gum. You don’t need to do this forever, but a few weeks of gentler eating can make a noticeable difference.
Pay attention to daytime habits. Many people clench their jaw without realizing it, especially while concentrating or stressed. A good rule: your teeth should be slightly apart and your jaw relaxed whenever you’re not actively chewing or speaking. Setting periodic reminders on your phone to check in with your jaw position can help break the clenching habit.
Specific exercises can also improve mobility and strengthen the muscles supporting the joint:
- Relaxed jaw exercise: Place your tongue on the roof of your mouth. Slowly open and close your jaw, keeping your teeth apart and the movement gentle.
- Resisted opening: Place a finger under your chin and gently push upward while slowly opening your mouth against the resistance. This strengthens the muscles that control the opening motion.
- Chin tucks: Tuck your chin toward your chest while keeping your head straight. Hold for a few seconds, then release. This helps with the neck tension that often accompanies jaw problems.
- Side-to-side movement: Open your mouth slightly and slowly slide your jaw from side to side with smooth, controlled motion.
- Forward jaw movement: Open slightly, then shift your lower jaw forward so your bottom teeth are in front of your top teeth. Hold for 10 seconds, then return.
Doing these for a few minutes twice a day is a reasonable starting point. If any exercise increases your pain, back off and try a gentler version.
Professional Treatment Options
When self-care isn’t enough, the first-line professional treatments are still non-invasive. Custom oral splints (often called nightguards) are the most common. These are molded to fit over your teeth and prevent grinding during sleep while also redistributing the forces on your jaw joint. Soft splints have a cushioning effect and relax the muscles, while hard splints are designed to stabilize the joint and improve how your bite lines up. Over-the-counter versions exist, but custom-fitted ones from a dentist work more reliably.
Physical therapy is the other main option. A therapist experienced with TMJ issues will guide you through targeted exercises and may use techniques like ultrasound therapy or manual manipulation of the joint to reduce symptoms. Many people see improvement within a few weeks of consistent therapy.
Surgery is rarely needed and is reserved for cases where the disc is permanently displaced, the joint has significant structural damage, or the jaw locks frequently and doesn’t respond to conservative treatment.
What Happens if You Ignore It
Painless clicking that stays painless may never need treatment. But when clicking is accompanied by pain, stiffness, or worsening symptoms, leaving it unaddressed can allow the problem to progress. Ongoing inflammation can damage the joint surfaces over time, and a disc that currently pops back into place may eventually stop doing so, leading to restricted movement or locking. Pain that starts as occasional can become constant.
The transition from “disc displacement with reduction” (the disc pops back) to “disc displacement without reduction” (the disc stays stuck) is one of the more significant progressions. Interestingly, when this happens, the clicking often stops because the disc is no longer snapping in and out of position. So a jaw that used to click and suddenly goes silent while becoming harder to open is actually a sign things have gotten worse, not better. Limited mouth opening or locking affects about 8% of people with TMJ disorders, making it less common but more functionally disruptive than clicking alone.