Ordinary people do not need to change their masks once, and when they are not in contact with suspected infected persons or confirmed patients, they can extend the use of masks for an appropriate period of time. The replacement of masks are as follows: 1, disposable masks: should be considered discarded after wearing; 2, ordinary medical protective masks: can be reused if there is no obvious staining and breakage, wearing time is recommended not to exceed 24 hours; 3, medical surgical masks: when there is no obvious staining and breakage, the wearing time can be extended appropriately. If you plan to reuse, you need to store the mask in a dry, clean and ventilated place, pay attention to separate storage and avoid contact with each other.