Which is the hardest substance in the human body?

Question

the substance you name should be present in human body itself .

Answer 1

I was gonna joke around and suggest the 'substance' between your legs, but that didn't really make sense... 0:)

It's tooth enamel - as described by Wikipedia - "is the hardest and most highly mineralized substance of the body".  It's made of 96% crystalline calcium phosphate.

Answer 2

enamel, which is a more mineralized "bone"  or hydroxyapatite has a hardness on the Mohr scale of above 8-8.2 Diamond on this scale is 10

Answer 3

tooth enamel