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It has been proved that many kinds of genetic diseases can influence the development of tooth, with symptoms of abnormalities in tooth structure, appearance.
目前研究发现多种遗传性疾病都能影响到牙齿的发育，表现为牙齿结构、形态、数目和萌出等方面的异常。
Expectant mothers may not know that what they eat affects the tooth development of the fetus.
准妈妈也许不知道她们所吃的食物会影响到胎儿的牙齿发育。
Objective: To study the pattern of dental development and tooth age.
目的：研究儿童牙齿发育的规律及牙龄。
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