yes, i know vitamin B-12 does it, and the bacteria in the mouth. here are some URLs to look at:
http://www.home.earthlink.net/~berniew1/damspr1.html
http://www.geocities.com/researchtriangle/2888/mmindental.html
http://www.google.com/search?hl=en&q=bacteria%2Bmouth%2Bmercury%2Bmethyl+inor...
http://www.google.com/search?hl=en&safe=off&q=bacteria%2Bmouth%2Bmercury%2Bme...
http://www.google.com/search?hl=en&safe=off&q=bacteria%2Bmouth%2Bmercury%2Bme...
Torrie