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.
Halitosis itself is a symptom of an underlying problem. If you feel a foul odor on your breath when you exhale, look out for the possible causes inside and outside your oral cavity. Another way to check whether your breath has an odor or not is to lick your wrist and let the saliva dry. After a few minutes, smell your wrist to figure out if you have bad breath or not. Since most of the causes arise within the oral cavity, the patient might also present with plaque deposits on the tongue and around teeth, redness and bleeding from gums, and multiple carious lesions.

Carrots, onions, and apples are also great for removing tonsil stones and reducing the bad smell since they kill the anaerobic bacteria that grow around the stones. Vinegar also breaks down and softens tonsil stones, making them easier to remove.
Ultimately, the bad-breath campaign was so successful that marketing historians refer to it as the “halitosis appeal”—shorthand for using fear to sell product. And, while the modern advertising industry is no stranger to creating a problem to sell its solution, Listerine’s medicalization of mouth odors might just be one of the most successful iterations yet.