During the epidemic of novel coronavirus pneumonia, it is recommended that everyone wear a surgical mask when going out. Surgical masks have a time limit for wearing them, such as simply wearing the surgical mask for a few minutes and not getting it wet if possible. Fold the mask up from the inside as much as possible after wearing it, so as not to contaminate the side that your mouth touches. Simply store the removed mask in a clean, ventilated area. Be sure not to get the mask wet. If the mask has been in use for a long time, it is important to change it in time. Freshly worn masks can continue to be worn if stored properly, but it is not recommended to wear the mask for very long periods of time, especially if it gets wet. Source: Dr. Yurai