Why should we correctly distinguish the front and back of the mask?

Door-to-door pickup has become a new way for countries to protect mask supplies.

With the outbreak of new coronary pneumonia in the world, many countries attach great importance to the problem of wearing a mask, because wearing a mask is not only a personal hygiene problem, but also to prevent the virus from spreading each other.

However, public health officials continue to emphasize that N95 masks and surgical masks should be reserved for first-line doctors and nurses in urgent need of protective equipment.

Most N95 masks are also consumables.

Here, the editor will teach you several ways to distinguish, let's learn together: how to distinguish between medical surgical masks and general medical masks?