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Which is the hardest substance in the human body?

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Answer: Tooth enamel is a tough shell, translucent; thin-layered that protects the tooth crown as well as the toughest tissue in humans. 

  • Enamel is composed of hydroxyapatite.
  • Hydroxyapatite is calcium phosphate crystals.
  • Enamel protects teeth from decay and erosion caused by tooth usage such as munching, biting, and so on.
  • It also prevents cracks and sensitivity in the teeth.
  • Enamel damage cannot be reversed because enamels are just not living cells.
  • Acid reflux, carbonated drinks, and fast food can all harm the enamel. 
  • Enamel damage causes erosion and cavity formation in the tooth.
  • Brushing, flossing, and rinsing are essential for maintaining healthy enamel.