My dentist cannot seem to find the source of my bad breath?

bad breath
tut_oyer asked:

I brush three or two times a day.
I floss once or twice a day.
I use mouthwash.
I clean my tongue.
I use breath mints and gum.

I have no cavities or gingivitis or any other gum disease.

What can be wrong?
And I don’t eat such foods as garlic, fish, or other obvious things that make breath stink.

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