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Mercury fillings given to millions of Britons every year can be dangerous, the world's biggest health regulator has warned.
Simply chewing could release harmful mercury vapour from the fillings which could be breathed into the lungs, the U.S. Food and Drug Administration said.
The regulator had previously advised U.S. dentists that the fillings are safe.
Despite the warning, the British Department of Health issued its own statement yesterday that it continued to believe mercury fillings posed no danger.