Method: The sample, randomizelly divided, was submitted to the treatment with the infrared low intensity laser of GaAlAs, in the wavelength of 830 nm and with a dose of 60J/cm² twice a week, in points of the masseter, temporal and esternocleidomastoideo muscles. For the group 2, a placebo laser was developed with an identical light guide, however, without the laser irradiation. The effectiveness of the treatment was evaluated in the second application of each week and after 60 days at the end of the therapy, starting from the use of (VAS) Visual Analogue Scale, width of the mandibular movements and the presence of pain to the pressure of the muscles
Result: Active treatment resulted in a significant improvement in all evaluated parameters during and at the end of the experimental period.
Conclusion: The low level laser could be considered efficient for patients who present myofascial pain guaranteeing the improvement of the quality of life, reducing the symptoms and the physical, social and psychological impact.