Generally speaking, if the mask is not obviously dirty or deformed, it does not need to be changed every four hours, but if it is dirty, deformed, damaged, or smells, it needs to be replaced in time.
Whether the thicker the mask, the better the protective effect
The thicker the mask, the better the protective effect. Medical surgical masks look relatively thin, but they have three layers of water blocking layer, filter layer and moisture absorption layer. The three-layer structure can block virus invasion. Therefore, as long as you have these three layers of masks, one is generally sufficient.
How to store the mask
Ordinary residents use disposable masks in places with relatively low risks. They can be reused as long as the masks are clean and structurally complete, especially when the inner layer is not contaminated. They should be kept in a relatively clean and dry room after each use. Ventilated place. The mask must be stored separately and the user must be identified.