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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.