Cotton masks Advantages: can be used repeatedly cleaning,

Disadvantages: the mouth of the mouth part of the nose and mouth will leave the saliva, if not diligent in cleaning, easy to breed bacteria, do not meet the health requirements. Cotton masks are generally very thick fiber, can not effectively filter the smaller particles, and most of the international safety certification, the protection effect is not guaranteed. Gauze masks are almost useless, too much on both sides of the nostrils.

N95 masks:

Used to avoid wearing people who are infected; can not prevent the patient to spread the virus to others.

Surgical masks: Although to avoid the efficacy of infection as N95, but can prevent the patient to the virus transmitted to others.