It isn’t mandatory for children from Kindergarten to grade 3 to wear masks. I’ve heard masks can become ‘unsafe’ if not worn properly…is there any truth in that?

According to the CDC, younger children (e.g., preschool or early elementary aged) may be unable to wear a mask properly, particularly for an extended period of time. A recent Rapid Response Report from Alberta Health Services, visible here, found that self-contamination of the hands or face with improper donning and doffing technique was worthy of concern, especially with younger children.