Which among the following is the hardest part of our body?

Question

Which among the following is the hardest part of our body?

1. A. Skull bones
2. B. Thumb nails
3. C. Rib bones
4. D. Enamel of teeth (Correct answer)

Correct Answer

Option D — Enamel of teeth

Detailed Solution & Explanation

The correct answer is Enamel of teeth.

Key Points

• The enamel of teeth is the hardest substance in the human body, harder than bone.
• Tooth enamel is 96% hydroxyapatite (a crystalline calcium phosphate), making it extremely hard but also brittle.
• Once damaged, enamel cannot regenerate as it has no living cells after formation.