When your teeth begin to (decay), you should go to see a dentist at once.

如果你的牙齿开始蛀了，就应该马上去看牙医。

youdao

When your teeth begin to (decay), you should go to see a dentist at once.

如果你的牙齿开始蛀了，就应该马上去看牙医。

youdao