Hi Kora , 
I wonder if bruxism( pressing your teeth hardly while sleeping) is also a compulsive action that’s related to cerebral cortex  ? Or is it a brain stem response since it’s biting ??or is it a healing peak of recurring biting chunk because at last it leads to stiffness in jaw muscles and bones  and loss of function, could you plz explain this for me :) 
Thanks a lot for your endless help , and plz if you can check above there is another question about baldness I guess you missed it  :)