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。

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Have I got bad breath?

我有口臭吗？

《牛津词典》

Smoking gives you bad breath.

吸烟会导致口臭。

《牛津词典》

Let's say that you know that a specific chewing gum makes your breath bad.

假设你知道有一种口香糖会让你有不好闻的口气。

I've been 课堂 - SpeakingMax英语口语达人

You can say, "I told you that this gum makes your breath really bad."

你可以说，“我跟你说过这个口香糖会让你有难闻的口气的。”

I've been 课堂 - SpeakingMax英语口语达人

This can lead to a condition called "ketosis", which can cause bad breath, nausea and a bad taste in the mouth.

BBC: Health risk of 'faddy diets'

For the food firms, gum that sweetens bad breath and whitens teeth is a hot market.

ECONOMIST: Medical confectionery

In our smothering proximity, we shared everything else snores and farts and bad breath and odorous feet.

NEWYORKER: Rat Beach