Is the mercury in amalgam fillings toxic?
There is a controversy over the potential adverse health effects of silver amalgam fillings, which are close to 50% mercury. Although mercury is toxic, it has been thought that it was not released to the body during use as a filling material. Recent research, however, seems to show that these fillings release a very small amount of mercury vapor during chewing. Whether or not this amount of mercury is harmful to the body is a subject of controversy. Most people have some silver amalgam fillings in their teeth with no apparent adverse effects. No harm from the mercury in amalgam fillings has ever been absolutely proven. However, it has never been proved that it is not harmful, either. Many people are preferring the mercury-free fillings because of this health issue.
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