There are many causes of alterations to the temporomandibular joint, which act as triggers for pain. Disturbances of this joint affect both the muscles of mastication and the other structures with which it is associated. Pain and a limited opening of the mouth are characteristic symptoms of this disorder and are observed in 60-70% of the general population. In certain circumstances, the pain may progress to persistent or recurrent, becoming an important cause of chronic facial pain. After the exclusion of headaches and otorhinolaryngologic disorders as causes of chronic facial pain, the following step is to consider a disorder of the temporomandibular joint, particularly if the pain is associated with clicking of the joint and limited opening of the mouth (59).