a n95 mask is for use when there is contamination, so yes with a face shield it would reduce the risk of that person being exposed to what you call a virus. but it wouldn't stop an infected person breathing the virus into the air. also the size of a virus comes into question & the ability to stop exposure to it. but i don't believe disease is caused the same way you do. why have you changed your direction from the simplicity of wearing a mask & using a dentist & an operating room as a comparison to a store? is it because you now realize a surgical mask won't prevent someone inhaling the virus you believe in?
https://drive.google.com/file/d/1AmD..._swBAWhq6/view
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