Name the hardest substance in the body

The hardest substance in the human body is tooth enamel. Tooth enamel is the outermost white layer covering each tooth. It is made mainly of calcium phosphate in the form of a mineral called hydroxyapatite. Enamel protects teeth from decay, wear, and temperature changes.

Composition of Enamel

• 96% inorganic materials (mainly calcium phosphate)
• 3% water
• 1% organic material (proteins)

Properties

Importance

• Prevents damage from chewing and biting.
• Acts as a barrier against acids and bacteria.
• Maintains tooth structure for life if cared for properly.