The International Academy of Oral Medicine and Toxicology (IAOMT) brings attention to an important new study, titled “Dental Amalgams and Blood Mercury Concentrations in American Adults.” The study provides convincing evidence that mercury amalgam dental fillings are elevating blood mercury levels to dangerous thresholds, and that blood is a key pathway for mercury distribution in the body.

Dental amalgam, a relic of a bygone era, has been used for over 150 years in U.S. dentistry to repair decayed teeth and contains 50% toxic elemental mercury, which is converted to inorganic mercury once inside the body. Data from the CDC’s National Health and Nutrition Examination Survey (NHANES) indicates that roughly 104 million Americans have mercury amalgam dental fillings. 

The study analyzed data from the CDC’s 2015–2016 NHANES survey, using blood mercury measurements from U.S. adults aged 18–70 to estimate exposures across 180 million Americans.

The study revealed that adults with amalgam fillings have significantly higher blood inorganic mercury levels than those without. The number of amalgam surfaces strongly correlates with increased mercury levels in blood, with an estimated 16 million adults exposed to daily mercury vapor doses exceeding the U.S. EPA’s safety limit.

The research also highlights blood as a key pathway for mercury vapor from dental fillings to accumulate in tissues and cells throughout the body, underscoring serious health risks, especially for vulnerable groups. Recent studies have linked amalgam mercury exposure to increased risks of asthma, arthritis, hearing loss, neurological disorders, and perinatal death.