2, the most common cotton mask.
3. The cotton mask has a single structure and can only be used for cold protection and warmth in cold weather. People who are sensitive to cold air can learn this kind of cotton mask, which is warm and comfortable. Usually, it is best to prepare more masks for standby and change them once a day.
4. Medical masks can prevent the spread of bacterial saliva to a certain extent, and can effectively prevent influenza. However, medical masks are disposable masks and should not be reused.
If you can't wear the mask correctly, the protective effect of the mask will be greatly reduced. Any mask is divided into front and back. Ordinary medical masks are darker in color and face outwards. One end of the metal strip with nose clip is above the mask. After the front and back of the outlet cover can be distinguished, put the dark side of the mask outward and the side with metal strips upward, hang the ropes at both ends on the ears, press the metal strips tightly with both hands, so that the upper end of the mask is close to the bridge of the nose, and pull down the mask to fully unfold it and cover the nose and mouth.