Being that they're harder than bone, teeth are also the last part of the human body to decompose, as they contain the hardest substance in the human body. What is that substance?

Answer Enamel

The calcium in teeth and bones means they stick around the longest. But teeth is the harder of the two, being made primarily of dentine, which is calcified tissue. The hardest part of teeth is their enamel, which is 96 percent mineral.

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