Dry mouth, bitter taste, and halitosis may be caused by poor sleeping habits, indigestion, stomatitis, and other reasons. It is necessary to identify the cause and treat it accordingly.

1. Poor sleeping habits: If you have a habit of breathing through your mouth while sleeping, it will cause your mouth to become dry and bitter, and you may also experience halitosis. You can practice consciously closing your mouth, or use a small adhesive strip to stick to your mouth while sleeping.

2. Indigestion: Indigestion can lead to food being stored in the stomach for a long time, resulting in excessive stomach fire. You can follow the doctor’s advice to take drugs such as Huoxiang Qingwei Granules, Chaihu Shugan Pill, and Citric Acid Mosapride Tablets.

3. Stomatitis: If oral inflammation is induced due to not paying attention to oral hygiene, it may also trigger the above conditions. It is important to develop good brushing and rinsing habits, and you can also follow the doctor’s advice to take drugs such as Cefixime Dispersible Tablets, Metronidazole Tablets, and Xiangpu Lan Oral Solution.

Besides, it may also be caused by factors such as stomach heat, esophagitis, and chronic gastritis, and targeted treatment under the guidance of a doctor is required.