CDC discounted the Denmark study siting 3k people were not enough to determine an outcome yet they use anecdotal stories about hairdressers as case for masking. 
There is reports from dentist noting mouth disease , called mask mouth now that  causes issues and decay happening because of the use of mask for long periods of time. This does show mask are causing harm.The Mayo Clinic lays out proper masking - I expect my school teacher to ensure my child is following these guidelines since the school is mandating my child wear a medical divide.

Children are not at risk and are able to build natural immunity if exposed at this time with minimal risk. It’s time to allow our kids to breath free- build immunity and break the cycle of drug induced antibody that will only prop up big pharmaceuticals  and the elite.

sincerely, a mother  of an 8 year old