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Which of these is considered to be the hardest substance in the human body?

  1. A
    Knee cap
  2. B
    Toe Nails
  3. C
    Elbow (bone) joint
  4. D
    Tooth Enamel

Solution & Step-by-step Explanation

Tooth enamel is the hardest substance in the human body. It is the thin, outer layer of the teeth that protects the sensitive dentin underneath. It is highly mineralized, containing a high percentage of hydroxyapatite, making it even harder than bone.

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Which of these is considered to be the hardest substance in the human body?
A
Knee cap
B
Toe Nails
C
Elbow (bone) joint
D
Tooth Enamel

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