Calcium composition: Bones and teeth are made of a calcium matrix not easily digested by the microorganisms that eliminate the soft tissue of the deceased. So a skull will have intact its teeth. Eventually even these components are degraded but it takes a much longer time.
Answered 4/6/2013
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Nature: That is how nature made you over millions of years of evolution. Teeth are used in defense, chewing, and speech.
Answered 4/14/2013
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