Whether it is bad advice or not is a matter of opinion. Check the medical texts and you will find that gut issues among other things can lead to bad breath.
It's always detox this detox that. Detox for everything they don't even know what they are talking about they are just pushing detox products for companies.
Bitters can be anything bitter, even foods like bitter melon. And they can only help. If not for this problem they still offer other benefits such as balancing hormones and cholesterol and improving the absorption of nutrients. Furthermore they are not going to break the bank. Even using commercial bitters a person can get a 2 ounce bottle for about $6 that will last probably 5-6 months.
Can I ask why you haven't went to the doctor if its that bad? That sounds like H. Pylori you got there. NOTHING ELSE does that kind of thing.
Again check the medical tests because there are many other things than H. pylori that can do this. In addition, H. pylori secretes ammonia, which is why an ammonia breath test is used to determine its presence. Ammonia has a much different smell that was described.