teeth..

[chief]

what are cavity fillings made of?
(i think i posted this earlier but i cant find it)

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Chief's Domain - http://www.seas.ucla.edu/~ravi

[Strainger]

Amalgam, which contains "mercury, silver, tin, copper, and a trace amount of zinc" (from www.amalgam.org (http://www.amalgam.org) ) or porcelain.