The causes can be varied with treatments ranging from stress management to dental devices to minimise night grinding of the teeth. The thorough assessment of all possible precipitating factors is perhaps the most important starting place. Carefully check the cervical spine for any anomolies. I am sure any craniosacral readers would have a field day on their input into this? Also the trigger point fraternity will offer comment. TMJ dysfunction presents from a range of possible causes, each person being different to the last. Assess, treat, assess, treat. If you follow that simple process you won't waste time exploring in the wrong direction.