Traces of mercury in organs from primates with amalgam fillings
"These results strongly support what has been suggested previously that dental fillings in primates cause absorption of mercury released from amalgam fillings through lungs and intestinal tract, and that depending on exposure mercury is distributed to most organs and will eventually be found in the central nervous system."
Just a reminder, Humans ARE Primates. :)
Source: Experimental and Molecular Pathology via PubMed