Plenty of patients have bad breath. They never tell me, and I never mention it because I have no solution better than mouthwash. If you want to know how to eliminate bad breath, google any media doctor. They all know. They’ve been delivering the same advice since I entered practiced forty years ago, and I haven’t noticed a decline in bad breath. On the other hand, they’re rich, and I’m not.
Perhaps a dozen times (mostly before I became a hotel doctor) patients announced that they had bad breath. I smelled. They never had it but were skeptical when I reassured them.
You have bad breath if someone else tells you. If you’re the only one who detects it, you have a delusion. Of course, since it’s a delusion, no one can change your mind.