What is the most delicate way for a person to say that his mouth stinks?

What is the most delicate way for a person to say that his mouth stinks?
I will be ashamed to tell a person that he does not smell good from his mouth. And I put myself in their place, I understand how awkward it is.

give him a chewing gum with menthol and it will reach him. maybe ... modern ... someday ... then.

Give him chewing gum.
Say - "for fresh breath."

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