He had bad teeth, irregular and discoloured.

他的牙齿不好，不整齐，而且变了色。

《柯林斯英汉双解大词典》

I can see you have two bad teeth.

我发现你有两只坏牙。

youdao

But if you have bad teeth, forget it.

但如果你有坏牙，忘了它吧。

youdao

Bad teeth can be painful -- and worse.

VOA: special.2009.03.11

they've got really bad teeth.

的牙齿不好。

优雅的英式英语 - SpeakingMax英语口语达人

She smiled determinedly, even a bit frantically, her lips stretched over perhaps bad teeth.

NEWYORKER: Free Radicals

"Many people with bad teeth also may have risk factors for heart disease, " Quyyumi said.

CNN: Brush your teeth, save your life?

Its tubercles and soft tissues were inflamed, and the annulus fibrosus of its disks was the color of bad teeth.

NEWYORKER: Backbone