There is no evidence that mercury in filling are harmful.  An extensive review published in 1993 by the U.S. Department of Health and Human Services concluded that amalgam fillings containing mercury pose no health risk, except in the extremely rare case that a patient is allergic to them. And while some people continue to worry that these fillings may be harmful to their developing or unborn children, no reliable studies since then have contradicted the government’s conclusion.  However amalgam filling are a choice. If there are personal worries about the mercury in amalgam filling talk to your dentist about other filling options.