Via the International Academy of Oral Medicine & Toxicology:
A new study in Clinical Chemistry and Laboratory Medicine found that people with dental amalgam fillings have higher levels of mercury in their blood than those without. Using data from a large U.S. health survey, researchers discovered that the more amalgam fillings a person had, the higher their mercury levels were. This suggests that mercury from fillings may enter the bloodstream and could build up in the body over time.
The abstract’s conclusion states that: “Persons with amalgams, desiring to lower their blood Hg concentrations, should consult with a dentist trained and certified in safe amalgam removal.”
You can access the full article, “Dental Amalgams and Blood Mercury Concentrations in American Adults,” here.
And in case you’re wondering how mercury gets out of those “silver” amalgam fillings and into a person’s body, there’s perhaps no better introduction to the topic than this classic video, “Smoking Teeth = Poison Gas”: