1 and 1897, Dr. mikulicz of Poland invented the world's first medical mask in order to avoid infection caused by droplets from breathing and coughing splashing on patients' wounds.

2. A mask is a sanitary product, which generally refers to a device worn on the nose and mouth to filter the air entering the nose and mouth to prevent harmful gases, smells and droplets from entering and leaving the wearer's nose and mouth. It is made of gauze or paper.

3. The mask has a certain filtering effect on the air entering the lungs. Wearing a mask has a very good effect when respiratory infectious diseases are prevalent and when working in polluted environments such as dust.