It’s important that you don’t touch the mouthpiece itself when you wear it and that you remove it by holding only the elastic bands. They should be removed as soon as they feel moist. Wash them at 60 degrees after use.
”The European Centre for Disease Prevention and Control agrees that medical face masks should be prioritised for healthcare workers. But it says non-surgical face masks might help stop the spread of coronavirus by people who are contagious but have no symptoms. This might be particularly useful in busy spaces, such as grocery stores, shopping centres, and on public transport, it says. Coronavirus is spread by droplets that can spray into the air when those infected talk, cough and sneeze.”
Of course frequent hand-washing and social distancing are still the most effective way to prevent the spred.