1. Refreshing: Caffeine and tea polyphenols in black tea help to improve brain vitality and alertness, and help to relieve fatigue.

2. Eliminate bad breath: Black tea can sterilize and remove the odor in the mouth, which helps to improve the problem of bad breath.

3. Promote digestion: The volatile oil and tea polyphenols in black tea help promote digestion and relieve stomach discomfort.

4. Lowering cholesterol: Tea polyphenols and flavonoids in black tea can lower blood cholesterol and help protect cardiovascular health.

5. Antioxidants: Polyphenols in black tea have antioxidant function, which helps to prevent diseases such as cancer and Alzheimer's disease.

6. Relieve stress: The ingredients in black tea help to relieve emotions and stress and improve mental health.

In short, moderate consumption of black tea can bring many health benefits, but care should be taken not to drink too much and not to mix it with certain drugs.