Smoking gives you bad breath.

吸烟会导致口臭。

His bad breath really grossed me out.

他的口臭实在使我恶心。

Have I got bad breath?

我有口臭吗？

Suppose you know that there is a type of chewing gum that will give you bad breath.

假设你知道有一种口香糖会让你有不好闻的口气。

Furry tongue or bad breath.

厚舌头或者口臭。