Halitosis

• ANATOMY OR SYSTEM AFFECTED: Gums, lungs, mouth, nose, stomach, teeth, throat

DEFINITION: Bad breath that is often caused by bacterial activity in the mouth

Causes and Symptoms

The primary cause of halitosis stems from anaerobic bacteria that reside in the back of the mouth, particularly on the back of the tongue. These bacteria break down proteins and generate smelly gases, especially hydrogen sulfide and methyl mercaptan. More than twenty-two different bacteria have been identified as producing bad odors in the mouth. Periodontal disease, decayed teeth, and infected tonsils are also sources of bad breath. Dry mouth caused by a decreased flow of saliva can produce halitosis. Foods such as onions, garlic, and hot peppers produce chemical odors that are expelled in the breath. In general, particles of food that remain in the mouth, on the tongue, or between teeth collect bacteria and can cause bad breath. Tobacco products cause halitosis, stain teeth, and irritate gum tissues.

Outside the mouth, chronic infections of the sinuses or lungs can also cause halitosis. Kidney failure has been associated with ammonia-smelling breath, while inadequate diabetic control results in sweet-smelling breath. Halitosis originating from the stomach is very rare, since the esophagus is a closed tube that connects the stomach with the mouth.

Symptoms associated with halitosis include foul-smelling breath, a bad taste in the mouth, a white-to-yellow coating on the tongue, and bleeding gums. For many people, the problem of bad breath is manifest only when they begin to talk. To detect bad breath, one should ask a family member, close friend, or dentist how one’s breath smells.

Treatment and Therapy

The basic treatment for halitosis includes brushing the teeth, tongue, and gums properly after each meal; flossing the teeth at least once a day; visiting the dentist regularly; drinking adequate fluids; and eating fresh, fibrous fruits and vegetables. Although it may take time and patience to overcome the gagging reflex, it is important periodically to clean the back of the tongue thoroughly and gently with a toothbrush or a scraper.

Some mouthwashes have been clinically proven to reduce bad breath effectively, as have some toothpastes. If a prescription for halitosis is necessary, doctors can prescribe chlorhexidine, an antiseptic mouthwash, zinc-based rinses, or probiotics. Prescription mouthwashes targeting dry mouth are also available. Chewing sugar-free gum, mint, cloves, or fennel seeds for a short time can likewise reduce the odor. Dentures should be cleaned properly every day and should not be kept in the mouth overnight. Nose and throat infections resulting in halitosis may need medical treatment.

Perspective and Prospects

Although Islamic and Jewish teachings implicate the stomach as a source of bad breath, it almost never originates there. In almost all cases, halitosis is treatable. Rarely is it an indication of a significant general health problem.

Bibliography

“Bad Breath.” MedlinePlus, 8 Sept. 2017, medlineplus.gov/badbreath.html. Accessed 26 Aug. 2025.

“Bad Breath (Halitosis).” Healthline, 7 Dec. 2020, www.healthline.com/health/bad-breath. Accessed 26 Aug. 2025.

“Bad Breath - Symptoms and causes.” Mayo Clinic, 21 Dec. 2023, www.mayoclinic.org/diseases-conditions/bad-breath/symptoms-causes/syc-20350922. Accessed 26 Aug. 2025.

Franklin, David. “Good Bacteria for Bad Breath.” Scientific American, vol. 308, no. 5, Jan. 2013, pp. 30, 32.

"Halitosis (Bad Breath)." Johns Hopkins Medicine, www.hopkinsmedicine.org/health/conditions-and-diseases/halitosis-bad-breath. Accessed 26 Aug 2025.

Icon Health. Halitosis: A Medical Dictionary, Bibliography, and Annotated Research Guide to Internet References. Author, 2004.

Miller, Richard A. Beating Bad Breath: Your Complete Guide to Eliminating and Preventing Halitosis. Noble House, 1995.

Rosenberg, Mel, and Daniel van Steenberghe, editors. Bad Breath: A Multidisciplinary Approach. Leuven UP, 1996.