I literally read dozens of studies, most of which folks had claimed proved masks worked, and many of which tried to make statements that masks would work, in certain conditions, or etc., but not one of them produced actual evidence that masks prevented viral transmission in practice. There remains no studies that show that masks of any kind prevent viral transmission in practice, and there are studies that show that masks harm people wearing them, and even cause more infections in surgery patients when the doctors wear masks.
One thing some studies showed, though, was that masks were like talismans. People believed in masks. This gave them better outcomes through the placebo effect. Life is weird.
Thanks!
Rosemary/Teatree oiled beards are best.
I'm sure they stop viruses every bit as well as any mask shoved over them.