permanent tooth

Permanent teeth are the second set of teeth in mammals, following the milk teeth. Humans typically have 32 permanent teeth, which are designed to last into old age. Each tooth consists of a crown, visible above the gum, and one or more roots anchoring it in the jawbone. The hardest tissue in the body, enamel, covers the crown of the tooth. Mature enamel is primarily composed of calcium and phosphate crystals and contains no nerves. Beneath the enamel is dentin, a yellowish tissue that forms the bulk of the tooth and is harder than bone but softer than enamel. Cementum, a bonelike material, covers the roots and serves as an anchor for the periodontal membrane that holds the tooth in its socket.12345