Miraculous Stanford Study on Negative Effects of Masks During Covid
(www.ncbi.nlm.nih.gov)
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Aren't you supposed to switch those medical masks out every 30 minutes or so? How often do you see people doing that in the work place?
In the Before Time I think they usually only wore them at specific times and would throw them away after, so I imagine they naturally would just get replaced at regular intervals. But I'm not a healthcare professional so I don't know exactly how that works, nor do I know what they do in situations like hours-long surgeries.
Normally I see people in the workplace wear them on their chin when no one's around. Hope your chin is clean...