Tell that to your surgeon and save $1.60 on your next hospital bill.
Not sure of your point?
A surgeon wears a mash to keep his spittle from landing on the opening he is working on.
In a procedural setting the masks are appropriately fit. They are worn once for a short period of time and then discarded. They are combined with a surgical handwashing (2 minutes is a very proscribed fashion ) sterile technique and sterile drapes. Once the mask is on it is not touched until the procedure is over. Plus a surgeon can hardly remove their hands from the sterile field to cover a cough or sneeze so they need something over their face
A far cry from the politically correct snot rags people are wearing again and again at the grocery store. If you cough or sneeze use a kleenex and throw it away.