Introduction:
This study evaluated the correlation between the occurrence of disorders of selected muscles of the cervical spine and the occurrence of symptoms of TMJ dysfunction.

Material and Methods:
The study was conducted with 60 participants. The examination includes a personal questionnaire, physical examination (measuring ranges of mandibular mobility, examination of the mandibular path and its deviations during the abduction, examination of the presence of TMJ acoustic symptoms in abduction, lateral movements and forward movement on both sides, evaluation of the tenderness of the temporomandibular joints area) and algometer measurement on the upper fibers of the trapezius, levator scapula, sternocleidomastoid and rectus capitis posterior major to define pressure sensitivity.

Results:
In algometer measurements, no differences were found between the results of the pressure sensitivity on the myofascial trigger points and the occurrence of TMJ dysfunction.

Conclusions:
Tenderness of muscles of the cervical spine does not correlate with the occurrence of dysfunction of the temporomandibular joints. There was no correlation found between the completed orthodontic treatment and the development of temporomandibular joints dysfunction.