Final answer:
The hardest and toughest tissue in the body that covers the crown of the tooth is known as enamel.
Step-by-step explanation:
The hardest and toughest tissue in the body, which covers the crown of a tooth, is called enamel. This formidable substance withstands the forces of biting and chewing and protects the underlying layers, such as the dentin and the pulp cavity. Dentin is a bone-like tissue that extends into the root of the tooth, while the pulp cavity contains connective tissue along with blood vessels and nerves. The root is covered by cementum which, along with the periodontal ligament, helps anchor the tooth in the jawbone.