We overheard that Medical masks or face masks are usually used for the sake of prevention of the spread of germs, and other diseases. These are widely used these days but only a few people know how it’s actually used. A Facebook user revealed how to use it correctly saying that if the white part is inside, a person is sick and trying to prevent his disease on spreading to others. On the other hand, having the white side out means a person is protecting himself from the environment.source:youtube

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