Dry mouth and bad breath should be alert to the following diseases: oral diseases (such as stomatitis), digestive diseases (such as gastroesophageal reflux disease), and other factors. 1. Oral diseases: poor oral hygiene, common stomatitis, gingivitis, etc., bacteria multiply in the mouth, appearing dry mouth and bad breath. 2. Digestive system diseases: Gastroesophageal reflux disease (GERD) is common, which may also cause dry mouth and bad breath. 3. other factors: long-term smoking, overeating, irregular diet may also cause dry mouth and bad breath, usually pay attention to light diet, avoid eating spicy stimulating food, relax. Dry mouth and bad breath, after adjusting the diet is not relieved, and accompanied by other discomforts, it is recommended that the hospital diagnosis and treatment as soon as possible.