In a surgical setting, masks must be changed every 20 minutes or so because even in a hygenically cleaned surgery, there is contamination. In any other setting, it's nowhere near as clean so a mask must be replaced every ten minutes AND every time it is touched. To do otherwise risks pneumonia and other diseases. And don't forget that hands must be washed before putting a mask on.

From this you can calculate, approximately, how many masks your child will need to take to school each day, hygenically packed. Also the risk of dermatitis from so much hand washing.

In a surgical setting, masks must be changed every 20 minutes or so because even in a hygenically cleaned surgery, there is contamination. In any other setting, it's nowhere near as clean so a mask must be replaced very ten minutes AND every time it is touched. To do otherwise risks pneumonia and other diseases. And don't forget that hands must be washed before putting a mask on.

From this you can calculate, approximately, how many masks your child will need to take to school each day, hygenically packed. Also the risk of dermatitis from so much hand washing.