I was watching the movie The Beautiful Truth that discusses Gerson Therapy and natural treatments for Cancer. Anyway they have a segment on Amalgams and show a video of a tooth thats over 50 years old with mercury Amalgams and show it offgas huge numbers using a mercury sniffer device. You can see it at http://www.youtube.com/watch?v=pQsi777_B1g
I'd love to believe the mercury thing is all hype and maybe it is to a certain extent in what its blamed for, but in the case of Amalgams it just appears to be all bad.