虽然乳牙会在某一阶段全部更换为恒牙，他们是非常重要的几个原因，包括槟榔、讲话。

While primary teeth will at one stage be replaced by the permanent teeth, they are very important for several reasons - including chewing and speech.

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虽然20颗乳牙一般全部萌出在3岁左右，但是萌出的步骤和顺序是多种多样的。

Although all 20 primary teeth usually appear by age 3, the pace and order of eruption varies.

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