The tooth also had all the components of normal teeth, including enamel, crown and root, and connective fibers to fix it to bone.

培育的牙齿还具备正常牙齿的所有组成成分，包括釉质、齿冠和牙根，以及使其固定于骨头的结缔组织纤维。

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The procedure used on McNichol involved his son Robert, 23, donating a tooth, its root and part of the jaw.

麦克·尼克23岁的儿子罗伯特参与了他的手术，他为父亲提供了一颗牙齿及其牙根，以及下巴的一部分。

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An infallible remedy for toothache: wash the root if an aching tooth in vinegar, and let it dry half an hour in the sun.

对牙痛的一项万无一失的疗法是：把作痛的一根牙齿放进醋里洗净利，然后置于阳光下半小时使之晒干。

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In the most serious cases the enamel is worn away to such an extent that the dentine (the substance that comprises the bulk of the tooth) or even the pulp (the root) of the tooth are exposed.

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It took 10 people to lift the sedated bear onto a make-shift operating table to have root canal done on the tooth.

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If you are removing it for prevention of tooth decay or periodontal disease such as gingivitis, which destroys the root and makes the teeth fall out then I believe it's best at night.

WSJ: How to Be a Better Flosser