It's very important to make a space maintainer if the second deciduous molar is lost too soon.

假如第二颗乳牙过早脱落，那摸装上间隙保持器是件要紧的事。

youdao

It's very important to make a space maintainer if the second deciduous molar is lost too soon.

假如第二颗乳牙过早脱落，那摸装上间隙保持器是件要紧的事。

youdao