Untreated Health Problems
Besides poor oral hygiene, another major cause of mouth odor is when a health challenge is not treated appropriately. However, this is noticeable when brushing and the use of a mouthwash is not sufficient. Examples of health challenges that may cause mouth odor are chronic sinusitis, chronic bronchitis, gastrointestinal disorders, postnatal drip, and respiratory tract infection. Hence, if the dentist discovers that the mouth is healthy, the individual may be referred to the doctor for further diagnosis.