By Hiroko Sato, hsato@lowellsun.com
Updated: 03/02/2009 07:16:45 AM EST
GROTON -- Picture this: You are holding a tooth with an amalgam filling extricated from your mouth under ultraviolet light.
David Kennedy can tell you what you will see next. There will be black shadows of your hand, the tooth -- and a steam-like substance rising from the top of the tooth.
That's exactly what the retired dentist from California saw at the International Academy of Oral Medicine and Toxicology (IAOMT)'s 2000 Symposium in Oxford, England, when taping the demonstration put on by his colleague, Roger Eichman of Washington.
The smoke is the vapor of mercury, an EPA-regulated toxin, in the amalgam, Kennedy said. The shadows wailed ferociously when Eichman rubbed the filling with a pencil eraser. Even dipping the tooth in 110-degree water accelerated the emission.
You should know the same thing is happening in your mouth, said Robert Evans, a Groton dentist. After learning about the invisible danger of mercury fillings at a conference like this one 26 years ago, Evans stopped using metallic implants altogether. And it's been the mission of he and his dentist wife, Jean Nordin-Evans, to educate the public about mercury fillings and what you can do if you've got one.