When using sanitary napkins, be sure to pay attention to the expiration date and purchase Disposable sanitary napkins. However, do not buy too many at one time, and it is not suitable for family storage for a long time. In order to save money, many female friends stock up in large quantities when encountering supermarket discounts. This is not advisable. Sanitary napkins have very strict hygiene requirements. The closer to the production date, the more guaranteed the quality. Sanitary napkins use high-temperature sterilization to achieve sterility. After all, the validity period of one-time sterilization and sterilization is limited. If sanitary napkins are stored for too long, they may become contaminated and deteriorate even if they are not opened.