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A face mask's main purpose is to keep out the liquid of an infected person's sneeze or cough from entering your mouth or nose (gross, I know). Wearing one can protect you from getting sick if you're in close contact with someone who is ill and also help prevent you from spreading your illness to someone else, as it's common practice for medical professions to wear them around sick patients. 10/20/50 PCS Disposable Face Masks Anti Virus Flu Medical Mask 3-Ply Dustproof Mask PM2.5 Face Mask Valved Respirator Mask Haze Dust Mask Anti Virus Flu +2 Filters 3Pc Filter 95% KN95 Anti-virus Face Mask Dust Proof Respirator Protection Mask Face masks can also help prevent hand-to-mouth viral transmissions, because you can't directly touch your own mouth while wearing one. Viruses, however, can be transmitted through your nose or eyes and virologists say that surgical face masks cannot block airborne viruses from entering your body.