When the joint that connects your jaw to your skull is damaged, it can lead to temporomandibular joint syndrome  (TMJ)
causes of TMJ disorders include injury to the teeth or jaw, misalignment of the teeth or jaw, teeth grinding, and gum chewing. 
It can lead to migraine, headaches, pain when chewing, swelling on the face.
treatment of TMJ in SmileArt includes  non invasive TMJ therapy with interoclusal splint, low laser therapy, hyaluronic acid joint injection and physical therapy.