The root of the mature and fully erupted tooth is composed of:

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The crown of the tooth is composed of the extremely hard outer enamel layer and the moderately hard inner dentin layer overlying the pulp of the tooth.The pulp is the soft innermost layer in the tooth.The moderately hard dentin continues to cover the soft tissue of the pulp of the tooth in the root(s),but the outermost layer of the root(s) is composed of cementum.The bonelike cementum is the part of the tooth that attaches to the periodontal ligament,which then attaches to the alveolus of bone,holding the tooth in its socket.

The Root of the Mature and Fully Erupted Tooth Is