Halitosis is an unpleasant odor in the breath coming from the mouth or nose, which can bother both the person and those around them.
Bad breath not only negatively affects interpersonal communication but can also lead to social pressure, psychosocial stress, and self-esteem issues. In some cases, it may even result in social and personal isolation. In recent years, knowledge about halitosis has increased. Direct measurement of volatile sulfur compounds (VSCs) produced by bacteria in saliva and breath has been developed, allowing the sources and causes of bad breath to be more clearly identified.
Patients with bad breath usually visit a dentist for an oral examination. After dental caries and periodontal disease, halitosis is one of the most common reasons people visit a dentist.
Does everyone experience bad breath?
Bad breath is common and can occur at any age. At least 50% of adults experience socially unacceptable bad breath at some point in their lives, especially in the morning after waking up.
Research shows that men are three times more likely to have halitosis than women. Additionally, individuals over 20 years old show three times more prevalence than younger people.
Even though halitosis is reported in about 50% of the population, very few patients seek treatment. People may not fully realize they have bad breath, a phenomenon called the “odor paradox.” Around 50% of men and 60% of women reportedly use cosmetic mouth sprays.
Does bad breath increase with age?
Middle-aged individuals often experience strong morning halitosis. In older age groups, the use of dentures, decreased saliva flow, and systemic diseases contribute to increased bad breath.
What causes bad breath?
Causes of halitosis can be pathological or physiological, and sometimes both.
- 80–90% of pathological halitosis originates in the mouth
- 10–20% originates outside the mouth
Oral causes include gum and mucosal diseases, fungal infections, tongue coating, reflux and postnasal drip, poorly maintained implants and dentures, dental caries, defective fillings, reduced saliva and dry mouth, oral cancers, cleft palate, and tonsil disorders.
If my oral health is good, where is the odor coming from?
The easiest way to differentiate oral and extra-oral sources is to compare mouth and nose odors. If halitosis originates outside the mouth, the first organ to consider is the nose. Nasal breathing is the preferred method of respiration, while mouth breathing—often due to nasal obstruction—plays a key role in halitosis.
If the odor originates from the nose or has medical causes, a physician should be consulted. One common anatomical cause of nasal obstruction is septum deviation, which can also lead to other persistent nasal problems. If no oral cause is found, mouth breathing due to septum deviation should be considered as a potential cause of halitosis.
Physiological causes of halitosis include hunger, menstruation, smoking, poor oral hygiene, food debris, high-protein foods, odoriferous foods like onions, garlic, radish, coffee, alcohol, and certain spices.
Should I be concerned about bad breath?
Halitosis may indicate upper or lower respiratory disorders, gastrointestinal issues, esophageal or liver disease, autoimmune disorders, blood diseases, chronic kidney failure, leukemia, AIDS, or metabolic disorders. Therefore, it should be taken seriously, and if not oral in origin, a doctor should be consulted.
Does smoking cause bad breath?
Smoking is a direct or indirect cause of halitosis through oral and periodontal diseases. Cigarette smoke contains volatile sulfur compounds (VSCs). Heavy smoking can lead to a coated tongue, which traps tobacco odors and food debris. Smoking-related halitosis usually lasts 24 hours. The tongue dorsum is the primary source of VSCs, and cleaning it reduces their formation. The longest-lasting effect is achieved by cleaning the tongue coating.
What should I do if my breath smells bad?
Treatment for halitosis involves:
- Maintaining oral hygiene
- Brushing teeth and tongue
- Cleaning between teeth
- Treating gum inflammation
- Encouraging reduced smoking
- Avoiding harmful foods
- Eating at regular intervals
- Visiting the dentist every six months
Why should I brush my tongue?
While many products remove plaque from teeth, the tongue—a major source of bacteria causing halitosis—is often neglected.
The back of the tongue is covered with a bacterial layer. Swallowing and a soft diet cannot remove this layer, leaving a white-gray, microbe-rich coating. The decomposition of this coating produces hydrogen sulfide and methyl mercaptan, directly linked to bad breath.
Plastic tongue scrapers and small brushes are designed to clean the tongue surface. Patients should extend the tongue as much as possible, place the scraper/brush at the back, and gently pull it forward. Halitosis patients should repeat this several times a day.
What should I do if my child has bad breath?
Different age groups have specific halitosis patterns. For example, children aged 2–5 often develop halitosis due to food debris and bacteria trapped in tonsil crypts.
A pediatric dentist should be consulted first. If halitosis persists despite proper diagnosis and treatment, a general physician should then be consulted.