There are many scientific studies that show huge differences in hg levels in the jaw, the gums and the oral mucosa between people with several amalgams and those with none. Dr Maly found jaw hg levels of 1200ppm in people with both gold and amalgam as opposed to controls who had approx one ppm.
Freden found average gum tissue levels of 147 micrograms/gm in people with amalgam vs 3 micrograms/gm in a control group.
A German study found jawbone levels of over 5000 ppm in jawbone under a gold crown covering a mercury filling.The ADA tells us the hg stays put in the filling
Joints have collagen and the colagen molecules are held together by disulfide linkages. Mercury interferes with these sulfur bonds which is probably why your jaw stops hurting when your amalgam is removed.
Amalgam is probably the main cause of TMJ.