Non-Invasive Treatments for TMJ   Temporomandibular joint disorder, better known as TMJ or TMJD, afflicts a sizable portion of the estimated 15 percent of Americans who suffer from facial pain. Reasons can vary, but often include: jaw grinding at night, constant clenching from stress, previous dental surgery and excessive gum chewing. Symptoms range from tooth and jaw pain to headaches, neck stiffness, earache and tinnitus (ringing in the ears). Since…