牙齿是垃拉交关多脊椎动物(鸟类除外)个头部(或口部)内,功能用来咀嚼食物个钙化组织。肉食性动物尤其倚赖牙齿进行猎食或搏斗、御敌。牙齿个构成成份弗是骨骼,而是由动物体内弗同密度托硬度个复杂组织组成,渠个根部则由牙龈包复、固定。
一些动物牙齿里有着更复杂个神经,比如独角鲸,渠个牙齿有着上百万神经,是乃朝已晓得最复杂个牙齿(以神经学而论)。箇允许独角鲸牙齿具食物触觉,以搭导航、交配作用。
随着人类文明个创建,各种语言个发音已发展得多样化。语言发音均非常依赖牙齿、舌头搭口腔个合作,应用到人类生活中个说话、歌唱。牙齿拉古代被称为“雅言”,牙齿个整洁,甚到关系到社交活动搭地位。专门为牙齿服务个医学,称为牙科。
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