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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 basic structure of a tooth consists of three main regions: 1  enamel - the surface layer of the tooth that is hard and protective. 2  dentine - makes up the bulk of the tooth. 3  pulp cavity - contains the blood vessels and nerves that feed and innervate the tooth.