There are various causes of bad breath, generally, it might be due to an accumulation of dental stains, plaque, and tartar in the patient's mouth, which are not cleaned in time, failing to develop a good habit of brushing teeth morning and night. It could also be due to the patient staying up late frequently, leading to internal heat in the body and gastrointestinal dysfunction, which might result in bad breath. Or it could be irregular eating habits, often consuming spicy and irritating food, causing the patient's body to have excessive internal heat.

In such cases, dietary adjustments can be made, adopting a light diet and regular living habits. If the patient has a lot of dental stains, they can visit a formal dental hospital for treatment and teeth cleaning. Removing dental stains, tartar, and plaque can eliminate bad breath and also provide good protection for the health of the teeth themselves.