If your jaw joint (temporomandibular joint) is aligned incorrectly it can cause clicks, grinding, or be painful to open or close.
It can also give rise to many other symptoms, e.g. headaches, migraines, tinnitus, balance problems and facial pain to name a few.
From the work done by Dr Brendan Stack it has also a role in the cause of motor disorders such as Tourette's syndrome, Parkinson’s and Dystonia.
Most treatments involve the combination of splints and orthodontics to realign the jaw position; this eliminates the symptoms in the majority of cases, especially headaches and migraines.
Please see Dr Brendan Stack’s and Dr Jeffrey Brown’s video to see how motor disorders are treated;
https://www.youtube.com/watch?v=SE2x37pWw88