Bad breath is most commonly caused by the smelly gases produced by the bacteria coating your teeth and gums. Food debris trapped in between the teeth can also start to decompose and cause a very unpleasant odor. So effective and regular tooth brushing and cleaning in between your teeth with dental tape or interdentally brushes and cleaning your tongue is crucial to keep your breath fresh. Strong foods like garlic coffee and onions and smoking of course add to the problem, as can having a dry mouth caused by certain medical conditions and some prescribed drugs and mouth breathing. Artificial saliva products may help. Infections in the throat nose lungs or sinuses and liver or kidney problems may also cause bad breath. If we can’t find a dental cause for your problem we may refer you to your doctor.