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the tooth which is visible above the gums is called the crown.

the uppermost layer is the enamel. then a very hard layer called dentine which protects the underlaying oulsp cavity . this contains nerves and blood vessels.

the lower tooth is divided into 2 or 3 roots depending upon the type of the tooth.

the roots contain a hard cementum which separates the root from the periodontal ligament, which in turn holds the root in place and cushions the tooth against the gum and jaw during the grinding, jarring activity of chewing.

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