Generally speaking, tea can be drunk as long as it has no mildew, no odor and is properly preserved. However, tea is also a kind of food and has a shelf life. Different teas have different optimal drinking periods, for example, green tea is about 1-2 years, and black tea, green tea and yellow tea are all between 1-3 years. It is not recommended to drink again after the best drinking period.

If it is Pu 'er tea, black tea and white tea, it has the characteristics of getting more fragrant with age and can be stored for more than ten years. As long as there is no mildew and odor, you can drink it. The longer it is stored, the better the taste.