Your baby teeth will fall out in two years time. 再過(guò)兩年你的乳牙就會(huì )全部脫落了。
We must be aware that their teeth may be undergoing dramatic changes as milk teeth are replaced by permanent molars and incisors. 我們必須注意它們的牙齒可能會(huì )經(jīng)歷重大的變化,乳牙會(huì )被永久的臼齒和門(mén)牙所代替。