Many elderly people are frugal and will repeatedly use the mask. This behavior will affect the mask protection effect service, be sure to advise the elderly to pay attention to the following matters: 1, disposable medical masks can only be used once; 2, take off the mask needs to be through the ear hanging, do not touch the outer surface of the mask; 3, do not touch the mask used by others to avoid cross infection; 4, do not take off the mask directly in the bag, pocket, etc., resulting in the risk of continuous infection. 5.The breathing resistance of N95 or KN95 masks is very high, and the elderly are prone to chest tightness and shortness of breath after wearing them for a long time, so it is not recommended.