Bile reflux gastritis can cause bad breath due to stomach contents flowing back to the throat through the esophagus, where the remnants of food create an odor in the mouth. First and foremost, maintaining oral hygiene, brushing teeth promptly, and consuming more vegetables and fruits can help improve bad breath. Additionally, active treatment may involve the use of proton pump inhibitors to suppress gastric acid secretion, as well as medications that protect the stomach lining. It is also important to manage diet by eating regular meals, increasing vegetable and fruit intake, and reducing consumption of spicy, stimulating, and greasy foods. Engaging in appropriate exercise after meals can help enhance gastrointestinal motility, speeding up the digestion and absorption of food. (Specific medications should be taken under the guidance of a physician.)