Using oral probiotics may be an effective way to fight bad breath. They’re known for helping your digestive system and can also have other benefits. They can also fight gum disease and plaque.

One of the most common causes of bad breath is the overgrowth of odor-causing bacteria in the mouth. These bacteria can cause volatile sulfur compounds if they aren’t eliminated by mouthwashes that kill them. This is what gives rise to the unpleasant odor.