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"Most people who wear them do not wear them properly."According to the Centers for Disease Control and Prevention (CDC), there's another reason that these masks might not work: different kinds of facial hair that can prevent the necessary impenetrable seal from being formed. In 2017, the CDC shared a somewhat inadvertently entertaining graphic that explains style-by-style the types of facial hair work under a mask, and the ones that don't.
As said here by Holly Secon