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2018年7月22日星期日

Six-year molars

The first permanent molars usually erupt between ages 6 and 7 years. For that reason, they often are called the “six-year molars.” They are among the “extra” permanent teeth in that they don’t replace an existing primary tooth. These important teeth sometimes are mistaken for primary teeth. However, they are permanent and must be cared for properly if they are to last throughout the child’s lifetime.

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