How can you tell if you have bad breath?

那么如何判断你是否有口臭呢？

youdao

I have bad breath.

我有口臭。

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You can also have bad breath when you have gingivitis.

你也可以有口臭时，你有牙龈炎。

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Beyond obvious mood spoilers such as poor hygiene and bad breath, we each have a distinct natural scent that appears to guide us toward choosing a partner with compatible DNA. Scientists have found that women prefer the scents of men with a complementary set of genes that code for the immune system.

CNN: The science of kissing