For those with several mercury amalgam fillings, dental amalgam is documented to be the largest source of mercury in most people, by far, by medical lab tests and Gov't agencies: www.flcv.com/damspr1.html
Mercury from amalgams is documented to be a cause or significant factor in over 30 chronic health conditions, including MS, Lupus, Thyroiditis, Depression, etc.
www.flcv.com/dams.html
For many of these conditions, there is documentation that most recover or significantly improve after amalgam replacement. See prev. URL
B. Windham