Introduction: The aim of this study is to evaluate the distribution of the most common etiological factors responsible for the development of chronic temporomandibular disorders, and to test the pain -relief effectiveness of combined gallium-aluminum-arsenide laser (GaAlAs; 785 nm) and superluminiscent diods (SLD; 633 nm) phototherapy (MedX 1100 device) for most common tension and compression pain-related diagnostic subgroups of chronic temporomandibular disorders.