The first permanent molars are emerging in the oral cavity without precursory teeth and often mistaken as primary teeth.

 
  • 摘要恒牙第一大臼齿是口腔内长出的第一颗恒齿,这颗牙齿并未取代任何乳牙,故家长往往误认为乳牙而忽视它。
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