Thursday, an FDA advisory panel could not determine if mercury fillings are safe, although they didn't find they were harmful either. Their final recommendation is that more studies are needed.
They had been meeting for two days to discuss the safety of fillings that contain mercury.
For decades, dentists have combined mercury with other metals to fill cavities, and recently there has been concern that the mercury could vaporize in the mouth and enter the blood stream.
A lot of people will argue against this, but no study has found a negative effect from mercury fillings.
In fact, the most recent research found there was no difference between mercury and resin.
The FDA is not required to follow the decision of the panel, however they often do.
The use of mercury fillings has gone down significantly in the past ten years, most fillings today use composite resin.