How to wear a mask correctly? First of all, wash your hands clean and open the packaging of the mask, judge the inner and outer layer of the mask, generally the inner layer is inside the folded layer, and the outer layer is outside the folded layer. Secondly, pick up the mask with both hands and spread both sides on the ears, press the metal strip at the upper end of the mask at the bridge of the nose with both hands, so that the upper end of the mask is close to the bridge of the nose, and stretch the mask downward so that the mask does not stay wrinkled, so as to maintain the tightness of the mask. Finally, after using the mask, you must wash your hands when you take it off and keep it in a cool, ventilated and dry environment.