I have done over 30 dental missions in many countries and was in practice for 26 years. There is zero reason to use a face shield when you are not performing aerosolizing procedures and a plastic shield does not help with odors at all.

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i have studied medicine and most of my friends are dentists. no one would ever wear a dog muzzler. some wear a face shield, some protect their eyes. i was in third world countries. they do all kind of shocking nonsense