Well, in short, according to 21 CFR 73.2150 and 21 CFR 70.3v of the FDA regulations, DHA is restricted to external application only when using sunless tanning products. This means no lips no inhalation from sprays just medicals fake simple topical additions.
There are various chronic diseases which can also lead to bad breath as well. Various lung diseases or liver diseases, for example, can cause bad breath. And that isn't all the medical conditions that you could be suffering from that can cause halitosis some of which you may not even know medicals fake you have.
With medicals bad and fake the news out there it can't be taken back. The only thing you CAN do, though, is maintain a level of dignity for "Joe" by assuring him that the discussion is just between the two of you.
Tooth and gum problems provide a perfect breeding ground for anaerobic bacteria that are responsible for breath odors in more than 90% of all people who suffer with a bad breath problem.
You the consumer are the only one who can assure yourself of getting the very best health care possible. Information is more important in this regard than money. Take Fran Fine for example. (The Nanny) With all her money, beauty and fame she was unable to get a diagnosis of her cancer for two years. The good news is that you can arm yourself with superb medical information using the internet but you need some training in selecting how to ween the best information from the masses of garbage that exist on the net. Over time, I will show you proven techniques in this art that will make you a high powered medical consumer.
Obviously, none of these methods will have much effect if you do not practice good dental hygiene. Be sure to brush and floss your teeth after every meal, and to not skimp on your visits to your dentist for routine cleaning and examination. Remember to brush the back of your tongue in a back-to-front sweeping motion, since the back of the tongue is where most bacteria that cause foul breath breed.