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新生的婴儿通常是没有牙齿的.当六个月大时,他们会长门牙.当他们两岁时,大多数的婴儿的乳牙长全.乳牙一共有20颗.
门牙是用来咬断食物的.智齿是用来磨碎食物的.这样一来会使食物更容易吞咽.
残余在牙齿上的很黏的或是富含糖分的食物如果不被牙刷清理,会产生蛀牙.
孩子到六七岁的时候乳牙开始脱落.原处长出新的牙齿会永远伴随孩子.
英语翻译Newborn babies do not usually have any teeth.Their front
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