Some types of bad breath, such as "morning mouth," are considered fairly normal and are not usually health concerns. However, persistent bad breath may be a sign of more serious problems with the gums and teeth.
Bad breath may be caused by the following:
- Poor dental hygiene poor oral hygiene can leave food particles to decay in the mouth
- Infections in the mouth such as periodontal (gum) disease Respiratory-tract infections such as throat infections, sinus infections, lung infections
- External agents including foods such as garlic, onions, and coffee, as well as cigarettes and chewing tobacco and dry mouth caused by salivary gland problems or by breathing through the mouth
- Systemic illnesses such as diabetes, liver disease, kidney disease, lung disease, sinus disease, reflux disease and others