The influx of ketones may be the biggest culprit of your nasty breath, but there are other factors at play, too. “The initial period of water loss in the body in the early stages of a low-carb diet can lead to dry mouth, another source of bad breath,” Dr. Wayne Aldredge, President of the American Academy of Periodontology, says.
Is there a cure for my dragon breath?
Your run-of-the-mill bad breath can be caused by a number of things, like not brushing or flossing enough, gum disease, or scarfing down a giant loaf of garlic bread. Those are all fairly treatable with some extra teeth brushing, minty gum, or actually flossing for once.
The rotten-trash-heap breath you get with a low-carb diet, on the other hand, is a whole other beast that occurs when ketones are released, not because there's more bacteria than usual. In fact, forgoing sugar and starchy foods may actually be good for your oral health.