The controversy over dental amalgam is due to the use of mercury as a component in the dental filling. A federal health survey called NHANES III discovered that the number of patients with amalgam fillings has a significant correlation with cases of thyroid problems, cancer, mental conditions, disorders in the circulatory, eye, and respiratory systems, as well as diseases of the nervous system. However, correlation does not necessarily mean causation and the US Food and Drug Administration say that the data presented does not show that dental amalgam poses a direct hazard to humans. Although dentists do acknowledge that a small number of patients can suffer from problems due to mercury allergy or sensitivity, there is still no substantial evidence that shows mercury poisoning is caused by dental amalgam.
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