We know that there is a bridge of nose on the mask, which is used to fix the mask on the bridge of the nose, but some of the bridge of nose is not metal, but also plastic.

If a general disposable mask does not have a nose bridge, it cannot fit the mask well on the face. The top and sides of the mask will leak out. Wearing it while keeping a distance from the crowd can also play a protective role. However, medical surgical masks are unqualified if they do not have a nose bridge.

Recently, the domestic new crown epidemic has rebounded again. Hong Kong, Xinjiang and other places are more serious, and other provinces have also increased in varying degrees. So when you buy masks, try to choose a formal channel. Usually disposable masks will display the words "disposable masks", and you can see that there is a bridge of nose.