Bad breath, medically called halitosis, can result from poor dental health habits and may be a sign of other health problems. Bad breath can also be made worse by the types of foods you eat and other unhealthy lifestyle habits. Conditions that cause halitosis include:
Nasal polyps
Bronchitis or pneumonia
Acid reflux and GERD
Chronic constipation
Digestive problems and stomach ulcers
High-protein diet that includes fish, cheeses, and meats
Foods that are strong smelling or spicy such as onions and garlic
Certain medications
Tooth decay or / and gum disease such as gingivitis
Dentures and bridges
Mouth sores
Smoking
Dry mouth
Post-nasal drip and congestion of the nasal passages
Food stuck between the teeth
Coating of the tongue caused by a build up of bacteria
Infection of the throat and tonsils
Sinusitis