Can you tell me the correct way to use the 3M mask?

The 3M mask has a good protective effect, which can prevent smog, PM2.5, dust and smoke in automobile exhaust. Good fit and comfortable to wear. The correct use method is as follows:

First of all, before wearing an unused mask, loosen the headband every 2 to 4 cm, and put your hand through the headband of the mask, with the colored side of the mask facing outward and the metal side facing upward.

Second, put on a mask close to the face, pull up the upper headband and put it behind your head, then pull down the headband and put it behind your head, and adjust the mask to a comfortable position.

3. Press the fingertips of both hands slowly inward from the middle to both sides along the metal strip of the bridge of the nose until they are close to the bridge of the nose. Don't pinch the metal strip of the bridge of the nose with one hand, which will make the metal strip have an acute angle, puncture the skin, lead to loose seal and reduce the protective performance. Hope to adopt.