人的一生中有乳牙和恒牙两副牙齿。儿童一般6岁左右开始换牙，整体遵循先下后上、从前到后的顺序。如果儿童出现乳牙滞留、恒牙迟萌、换牙期牙齿不齐的情况怎么办？这些家长关心的儿童换牙问题，来听听专家怎么说。
视频来源：空军军医大学口腔医院
编辑： 黄曼曼
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