Let’s get one thing straight right off the bat: no one is claiming that Listerine invented bad breath. Human mouths have stunk for millennia, and there are ancient breath freshening solutions to prove it. But, as Esther Inglis-Arkell writes at io9, in more modern days, advertisements for Listerine transformed halitosis from a bothersome personal imperfection into an embarrassing medical condition that urgently required treatment. Treatment that—conveniently—the company wanted to sell.
As we mentioned earlier, you do not have to live with bad breath. There are various approaches to the treatment of bad breath, and the good news is that you can begin at home!

Diet plays a significant role in halitosis. Certain foods, such as garlic and onions, contain sulfur compounds that can be released into the bloodstream and exhaled through the lungs, causing bad breath. Avoiding these foods or minimizing their consumption can help reduce halitosis.
Diabetes occurs when your body cannot produce insulin, which supplies your cells with the fuel they need in the form of glucose. When your body cannot burn sugar, it burns fat instead, which produces ketones that build up in urine and blood.