Tooth structure consists of several layers, each serving a specific function. The outermost layer is the enamel, which is the hardest substance in the human body and protects the tooth from decay. Beneath the enamel lies the dentin, a softer tissue that supports the enamel and contains tiny tubules that can transmit sensations. At the center of the tooth is the pulp, which contains nerves and blood vessels, providing nourishment and sensation. The cementum covers the root of the tooth, helping anchor it to the jawbone. Together, these components work to maintain the tooth's health and functionality.