"Myth: Standard surgical face masks can protect you from the virus
Standard surgical masks cannot protect you from SARS-CoV-2, as they are not designed to block out viral particles and do not lay flush to the face. That said, surgical masks can help prevent infected people from spreading the virus further by blocking any respiratory droplets that could be expelled from their mouths.
Fact: Special N95 respirators greatly reduce risk.
Within health care facilities, special respirators called "N95 respirators" have been shown to greatly reduce the spread of the virus among medical staff. People require training to properly fit N95 respirators around their noses, cheeks and chins to ensure that no air can sneak around the edges of the mask; and wearers must also learn to check the equipment for damage after each use."
Information via: livescience.com