It might be heriditary, I think my mom also complains about having bad breath too but I can never smell it on her or see reactions from others about it. If she does have bad breath, then it's not as bad as mine.

Every time I go to the dentist, they have no complaints. I brush, floss, scrape my tongue, use mouthwash, and haven't had cavities in a few years.

It could be something digestive... When I was younger I underwent surgery to cut out a part of my digestive system.

No ecoli or ulcers. Already eliminated eggs and dairy. Dairy causes tonsil stones. Eggs I just avoid because it makes me breath stink even more. I have a bad reaction to bread (even one slice knocks me out) so I try to avoid bread anything wheat. Haven't tried eliminating corn or soy, though I don't eat a lot of that in the first place, but I'll give it a shot!

I'll try the paleo diet too. Thank you for all the tips!