Bad breath that becomes more noticeable when you feel hungry is often caused by dryness in the mouth and reduced saliva production when the stomach is empty for a long time. Saliva normally helps clean the mouth and reduce bacteria, so when the mouth becomes dry, bacteria can produce an unpleasant smell. Poor oral hygiene, gum infection, plaque buildup, tongue coating, acid reflux, smoking, dehydration, or skipping meals regularly can also contribute to this problem. To help prevent the smell, try not to stay hungry for long periods and eat regular balanced meals. Drinking enough water throughout the day, brushing twice daily, cleaning the tongue gently, flossing between the teeth, and rinsing the mouth after meals can help keep the mouth fresh. Sugar-free chewing gum may also help by increasing saliva production. Avoid smoking, tobacco, and excessive tea, coffee, or spicy foods if they worsen the odor. If you also have gum bleeding, tooth pain, stomach burning, mouth ulcers, or bad breath that continues despite good oral hygiene, it is important to consult a dentist or doctor for proper evaluation and treatment. Treating the underlying cause usually gives the best long-term relief from bad breath.