Permanent lung damage in young children? Chronic ear, nose and throat infections with kids who don't understand 'mask issues'?
If a second grader drops their mask on the school bathroom floor do they pick it up and put it back on? Does Mommy wash the mask daily? Etc etc etc..
As usual the experts will have excuses after the damage is done.
Apparently, in a lot of our colleges, students have contests re how long their mask has been used. Sometimes these students have mask contests with siblings and parents re the oldest and longest used masks.