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Earlier discussion
2 older comments kept for context.
Oluwaseun Adeyemi
Enamel is the hardest substance in the human body and contains the highest percentage of minerals (at 96%), with water and organic material composing the rest. The primary mineral is hydroxyapatite, which is a crystalline calcium phosphate.
Fapuro Oluwadarasimi
The hardest material in the body of animals is enamel.