A click when opening the mouth is very common and does not by itself need treatment. When it should be monitored, and which added symptoms mean you should be seen.
A great many people hear a click in front of the ear as they open the mouth, and most have lived with it for years. The sound is not in itself a disease; knowing what makes it, though, makes clear when it should be taken seriously.
Where the sound comes from
The jaw joint is where the head of the lower jaw sits in a hollow of the temporal bone. Between the two lies a cartilaginous cushion called the disc. As the jaw moves, the disc glides with the head of the bone and prevents friction.
When the disc slips forward from its normal position, the head of the bone passes beneath it and snaps into place as the mouth opens; the click is the sound of that seating. If the disc slides forward again on closing, a second sound is heard.
How common it is
A substantial share of the population has sounds from the jaw joint, and the great majority have no symptoms at all. The sound alone is therefore not considered abnormal.
For this reason dentistry does not take a "there is a sound, let us treat it" approach. The decision to treat is driven by pain and loss of function, not by the sound.
When it is monitored
Attention is paid when the sound changes over time. If a click heard on every opening has disappeared and been replaced by limited opening, it may mean the disc no longer seats. The loss of a sound is not always improvement.
The character of the sound also informs. A short, crisp click relates to disc movement; a continuous grating like sand suggests change in the joint surfaces and needs assessment.
Which added symptoms mean you should be seen
- Pain in the joint area or the chewing muscles
- Reduced opening, or the jaw catching as it opens
- The jaw deviating to one side on opening
- Jaw fatigue and headache in the mornings
- Fullness, ringing or a sense of pressure in the ear
- A sense that the bite has changed and the teeth meet differently
Where one or more of these accompany the sound, the picture is no longer just a noise and an examination is needed.
What usually lies behind it
There is no single cause; in most patients several factors overlap. The commonest group is overloading of the chewing muscles: clenching and grinding at night, holding the teeth together unconsciously during the day, biting nails or a pen.
A history of trauma, keeping the mouth open for long periods during lengthy dental appointments, chewing habitually on one side, and joint laxity are further factors. Stress magnifies all of them; it is not a cause but a powerful accelerator.
What happens at the examination
The joint is examined by hand first: movement is watched during opening and closing, the opening is measured in millimetres, and the chewing muscles are palpated. Tooth contacts and wear facets are checked; these are the most reliable evidence of night clenching.
Imaging is not needed in every patient. A panoramic radiograph gives general information about the bone; the disc is assessed with MRI where necessary. Advanced imaging is not requested for a sound alone.
How treatment proceeds when it is needed
The approach runs from simple to complex, and the great majority of cases stay at the simplest steps. The first stage is reducing load: avoiding hard, long-chewed food for a while, controlling yawning, and using small reminders during the day to keep the teeth apart.
A night guard relaxes both muscles and joint where there is clenching. Physiotherapy exercises and heat help markedly in most patients. Surgical options arise only in the small group that does not respond to prolonged conservative treatment.
What helps at home, and what to avoid
Forcing the jaw to "fix" the sound, deliberately producing the click or manipulating it by hand is the commonest mistake. These movements tire the joint and advance the picture. The sound should not be repeatedly tested.
What helps is plain: eating soft food for a while, avoiding very wide opening, not cradling a phone with the shoulder, noticing and changing one-sided chewing, and not sleeping face down. Where there is no complaint, the only thing to do is watch.
