 Patients over the age of 18 that will come to orofacial pain clinic in the department of Oral medicine, and which will be diagnosed as suffering from facial pain originating from chewing muscles MVP for at least three months, will be invited to participate in the study. The examination is the one we use routinely and includes: patient demographics: age, sex, marital status, occupation, and medical history. Pain characteristics includes : Location, duration, intensity subjective, the nature of the pain, whether pain is prolonged or not, frequency and duration of attacks, disruption of sleep, quality of life and everyday functioning work, company, whether the pain is accompanied by autonomic of systemic signs and whether the patient suffers from pain in the body outside the region head and neck. Patient will receive a questionnaire examining the accompanying emotional distress AXIS II. Masticatory muscle involvement will be examined by palpation, load testing, restriction or non-limitation of mouth opening. All of which are routinely use in our department. 