Bad breath is when people experience an unpleasant or even repulsive smell of their breath. They feel ashamed of it. This can lead to the avoidance of social contacts and social isolation. The cause of bad breath is usually in the mouth and almost never in the stomach. Permanently smelling from the mouth is a common condition.


Bad breath is usually caused by an excessive presence of particular types of bacteria. These bacteria break down proteins, creating volatile sulfur compounds. These sulfur gases have a very unpleasant odor and are therefore responsible for bad breath. The abundance of bacteria is almost always caused by plaque deposits on the tongue. This tongue deposit is the white-yellow deposit which is particularly located on the rear part of the tongue. It may contain an accumulation of large amounts of bacteria.
Also when gums are inflamed, breath may be less fresh because of bacteria.
A dry mouth contains less saliva, so any gases produced in the mouth may easier come out. A dry mouth can occur when, for example, too much coffee or alcohol is drunk and not enough water. A dry mouth can also occur in case of using specific medications, chronic stress, hormonal problems, old age and poor saliva production.
In addition to the above-mentioned causes, bad breath can also be caused by:


Bad breath is often noticed by the immediate environment, but also the patient may be bothered and, for example, have a bad taste in the mouth. Depending on the cause, other symptoms may also be present.
Some common signs and symptoms of bad breath are a white or yellow layer on the tongue, a bitter or sour taste in the mouth and inability to get rid of the odor by brushing and flossing properly.


A doctor usually makes the diagnosis of bad breath by smelling the breath. Examinations can also be done to determine the cause of the bad breath, such as:

In rare cases, the following tests may be performed:


The treatment depends on the cause of bad breath. At first, people with bad breath go to the dentist or general practitioner. They will give advice regarding nutrition, healthy digestion and proper oral hygiene. If the symptoms persist, searching is continued to find the cause. The general practitioner or dentist can refer the patient for further examination to the dental hygienist, the ear, nose and throat (ENT) specialist, a dietician or a gastroenterologist.


Many cases of bad breath are temporary and disappear with self-care. The prognosis for bad breath, caused by underlying medical conditions, varies depending on the disease.