If you wear a mask complying with NIOSH Standard N95, those have filters that can ensure that viruses will not pass through. They are difficult to breathe through and they are tight around the face. Some medical staff who are treating patients wear these kinds of masks in the hospital. Some also wear a 3-ply surgical mask.
Regular face masks which don't comply to this standard will not work at all.
If you wear a mask complying with NIOSH Standard N95, those have filters that can ensure that viruses will not pass through. They are difficult to breathe through and they are tight around the face. Some medical staff who are treating patients wear these kinds of masks in the hospital. Some also wear a 3-ply surgical mask.
Regular face masks which don't comply to this standard will not work at all.