The so-called temporomandibular joint ankylosis is caused by a disorder of the temporomandibular joint, an organic lesion that results in a prolonged difficulty in opening the mouth, or a complete inability to open the mouth, called temporomandibular joint ankylosis. In clinical practice, TMJ ankylosis consists of two main types: first, intra-articular fibrous or osseous adhesions due to lesions in one or both joints, and the inability to open the mouth or difficulty in opening the mouth, which we call intra-articular ankylosis. The other condition is due to damage to the surrounding soft tissues or muscles, such as scars caused by trauma, which restricts the movement of the jaw, makes it difficult to open the mouth, and results in intermaxillary contracture, which we call pseudoarticular ankylosis. Both of these conditions must be seen in a timely manner to improve the symptoms. If the scar is formed, the scar can be removed; if the organic lesion is present, the symptoms can be corrected and improved by surgery or by injecting medication.