Tooth enamel is the hardest substance in the human body.


Tooth Enamel
Image credit: Otis Historical Archives Nat’l Museum of Health & Medicine/CC BY 2.0

The white part of your tooth is harder than anything else in your body, even your hardest bone, made up of 96% mineral. In spite of this, though, it still decays when continually exposed to acids and sugars.



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