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The white, outer shell of a tooth is made of enamel, the hardest substance in the body. Under the enamel is a softer substance called dentine, and inside this is the soft, living heart of the tooth, called the pulp cavity. Beneath the hard outer surface, dentine forms the body of a tooth.he white, outer shell of a tooth is made of enamel, the hardest substance in the body. Under the enamel is a softer substance called dentine, and inside this is the soft, living heart of the tooth, called the pulp cavity. Beneath the hard outer surface, dentine forms the body of a tooth.
The bulk of the tooth is composed of dentin. The dentin of the crown is covered. by enamel and the dentin of the root is covered by cementum. The cementoenamel junction marks the. transition from root to crown and is known as the cervix or cervical region. Inside the dentin of the root and. the crown is a hollow chamber filled with the soft tissue known as pulp.