(C) The crown of the tooth is the visible part that projects above the gum line.It is covered by a hard,protective layer called $Enamel$.$Enamel$ is t

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(C) The crown of the tooth is the visible part that projects above the gum line.It is covered by a hard,protective layer called $Enamel$.$Enamel$ is the hardest substance in the human body and protects the underlying $Dentine$ from wear and tear during mastication.