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每颗牙均可分为三部分,露出于口腔内的叫牙冠,嵌于牙槽内的叫牙根,介于两者之间狭细的部分叫牙颈。在牙冠的表层有一层光亮坚硬的釉质,是牙体组织中高度钙化的最坚硬的组织,其硬度仅次于金刚石。牙内部的空腔叫牙腔或髓腔,牙的神经、血管通过牙根尖孔和牙根管至牙腔,与结缔组织共同组成牙髓,牙髓发炎时常引起剧烈疼痛。
Each tooth can be divided into three parts, exposed in the oral cavity is called the crown, embedded in the alveolar root, between the narrow part called the neck. The crown of the crown has a bright, hard enamel that is the most calcified, hard tissue in the tooth tissue, with hardness second only to diamond. The internal cavity of the tooth is called the cavity of the tooth or pulp, the nerve of the tooth, and the blood vessel passes through the apical foramen and the root canal to the cavity. Together with the connective tissue, the dental pulp is formed. Inflammation of the pulp often causes severe pain.