 MethodsDesign: A placebo-controlled, double-blind, randomized, clinical trial will be carried out involving 30 women between 18 and 40 years of age with a diagnosis of myogenous TMD. The participants will then be randomly allocated to two groups totaling 15 individuals per group. Group 1 submitted to a session of phototherapy with 39,27 Joules per point one group will receive placebo therapy 0 Joules. The following assessment tools will be administered on four separate occasions baseline and immediately after, 24 h after and 48 h after phototherapy. Pain intensity will be assessed using the visual analog scale for pain, meter for range of movement, and electromyographic EMG analysis on the masseter and anterior temporal muscles. 