7个月，恒牙都长了，又白又齐。

By 7 months: All permanent teeth are in and are white and clean.

你多希望孩子的牙都换成了恒牙。

You wished for your child to have all permanent teeth.

大概到6岁左右，宝宝的恒牙开始长出来，这时乳牙才会脱落。

Baby teeth won't fall out until your child's permanent teeth are ready to come in, beginning around age 6.

如果婴儿过早的失去牙齿，恒牙可能会爆发式的错位长出而需要正畸。

If baby teeth are lost prematurely, the permanent teeth may erupt malpositioned and require orthodontics later on.