I have suffered from severe halitosis for close 10 years now and it has made my life a living hell. I have tried a plethora of different remedies, but nothing has worked for me, including the remedies that everyone on this site sings praises about - such as Hydrogen Peroxide, Probiotics, Liquid Chlorophyll, Activated Charcoal, etcetera. These help temporarily, but the stinky mouth and bad taste in the mouth always eventually return. After years of struggling to diagnose the root cause of the issue, I finally managed to pin it down to PND (post nasal drip). Managing chronic PND is expensive as it requires you to see a specialist and their rates are through the roof. Someone suggested I try cutting out gluten and dairy and perhaps going vegan to cure the issue but that wasn't feasible or affordable for me.
About a month ago, I started taking a cranberry extract (supplement) to help manage a recurring UTI and thrush problem - I swear I was getting vaginal thrush every single month. Lo and behold! Not only did the thrush and UTI issues disappear, but so did my halitosis! I was astonished! Especially because I wasn't even trying to cure the bad breath. Isn't that ironic? That I found a cure for my bad breath while attempting to treat a completely different health issue. I have no idea what's in cranberries that makes them completely get rid of bad odor. Even the little body odor I had has gone away. I don't even get morning breath! I will be forever grateful to cranberries for this. I had no idea that the solution to my problem was staring me in the face all along.
P.S. This solution works even better if you drink a lot of water (2 liters daily) and practice good oral hygiene. The solutions to all our health issues really can be found in nature!