Final answer:
The three different surface structures of a tooth are enamel, dentin, and cementum. Enamel is the outer layer of the crown, dentin supports the tooth, and cementum covers the root and anchors the tooth.
Step-by-step explanation:
The crown, neck, and root are a tooth's three distinct surface structures. Enamel, the toughest material in the human body, covers the visible portion of the tooth above the gum line, which is known as the crown. It serves as the practical surface for chewing and biting.
At the gumline, the neck—also referred to as the cervical region—marks the separation between the crown and the root. The part of the tooth that is anchored in the jawbone is called the root. The tooth within the dental arch receives stability and support from the root, which is covered with cementum and joined to the alveolar bone by periodontal ligaments.