Final answer:
Both the Clinical Crown and the Anatomical Crown of a tooth are covered by enamel, which is the hardest material in the human body and protects the underlying dentin and pulp cavity.
Step-by-step explanation:
Both the Clinical Crown and the Anatomical Crown of a tooth are covered by a hard substance known as enamel. The Clinical Crown refers to that portion of the tooth which is visible in the mouth above the gum line, while the Anatomical Crown includes both the visible part and the part of the tooth that is covered by the gums. Enamel is the hardest material in the human body and serves as the outermost layer, protecting the underlying dentin in the crown of each tooth. Dentin is a bone-like tissue that surrounds the pulp cavity, which contains nerves and blood vessels.