Hi! I´ve had also several problems with bad breath. Started after Antibiotics and got worse with GERD. Nothing wrong was detected. Doctors said my problem was stress (as if I can take vacations from my life...). I was suffering too much with digestion and GERD these days, which caused terrible bb. Accidentally, I ate a not completely cooked potato. My GERD got much better in less than 15 minutes. And the bad odor was almost completely gone, I would say 90%. I don´t know if this can help you, but it helped me and my digestion. I read that raw potato (sliced, grated or juice) help to improve digestion. It worked better than omeprazol and other digestive medicine.I hope this can help anyone.