Temporomandibular joint (TMJ): what it is and what it involves

November 11, 2026 · 2 min read

Quick facts

Definition: Joint between the condyle of the mandible and the temporal bone, one on each side.
Movements: Opening and closing the mouth, sliding the jaw forward and to the sides.
Structures: Condyle, articular fossa, articular disc, ligaments and the muscles of mastication.
Problems: Pain, clicking, limited opening and deviations, grouped under temporomandibular disorder (TMD).
In facial harmonization: Previous pain or dysfunction should be recorded before working on the lower third.

The temporomandibular joint (TMJ) connects the mandible to the temporal bone of the skull, one on each side, in front of the ear. It is one of the most used joints in the body, since it takes part in chewing, speech and yawning.

What is it made of?

The mandibular condyle fits into the fossa of the temporal bone, and between the two lies an articular disc of cartilage that cushions and guides the movement. The capsule and ligaments hold the whole together, and the muscles of mastication (the masseter, the temporalis and the pterygoids) drive the movement.

Structure	Function
Condyle	Part of the mandible that articulates
Articular disc	Cushions and guides the movement
Muscles	Open, close and move the mandible

What are TMJ disorders?

Pain when chewing, clicking, locking, limited opening and headache are part of the picture known as TMD (temporomandibular disorder). Bruxism is one of the associated factors, and is often the reason the patient asks for toxin in the masseter.

Why does the TMJ matter in facial harmonization?

Because the contour of the jaw and the volume of the masseter depend on the bone and the muscle that the joint drives. Changing one of them without understanding the whole can worsen symptoms or create wrong expectations. Reading the jawline should include function, not only shape.

Also called: TMJ, jaw joint.

Frequently asked questions

Can someone with TMJ pain have facial harmonization?

It depends. The dysfunction should be assessed first, and procedures on the masseter or the mandible may call for caution or postponement. The decision rests with the qualified professional, after assessment.

Terms mentioned

Mandible Masseter muscle Temporalis muscle Medial and lateral pterygoid muscles Bruxism Temporomandibular disorder (TMD)Mandibular condyle

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