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Hardest Part of the Human Body?

  • A.Tooth enamel
  • B.Femur
  • C.Temporal bone of skull
  • D.Knee bone

Answer: A

Tooth enamel is the hardest substance in the body.

It is about 96 per cent mineral, mostly hydroxyapatite crystals packed into rods, and rates 5 on the Mohs scale. Being acellular it cannot repair itself, which is why a cavity never heals.

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