This is a condition that affects up to 50% of the population and is characterised by persistently unpleasant breath. Despite the widespread belief that the stomach is the main cause of bad breath, 85-90% of cases have their origins in the oral cavity.

It is distinct from the temporary bad breath that may manifest itself on getting up or after eating certain foods.

Among the oral causes, the most common are poor hygiene around the tongue and teeth, a dry mouth (xerostomia) and faulty reconstruction and prostheses.

If the cause has an oral origin, treatment will entail treating the cause responsible. In the case of periodontal diseases, treatment will need to be carried out by the periodontist.