Milk is not suitable for drinking no matter how long it has been expired. Milk after the expiration date may be spoiled, bacteria overload and other problems, are not suitable for continued consumption, especially pasteurized milk, shelf life is very short, after the shelf life is prone to bacterial growth, so it is not suitable for drinking. Drinking milk past its shelf life may cause nausea, vomiting, diarrhea, etc., and in severe cases, may cause food poisoning. If autoclaved milk has just passed its shelf life, although some patients do not have any abnormality after drinking it, it is still not recommended to drink it in order to avoid adverse reactions. Whether it is pasteurized or autoclaved milk, you need to drink it as soon as possible after opening it, and if you can’t drink it immediately, you need to put it in the refrigerator and seal it, and try to drink it within 24 hours. If the room temperature is too high, the opened milk can appear in a short period of time and a large number of bacteria, even in the shelf life can still lead to human gastrointestinal tract adverse reactions.