Wearing the mask lowers the odds (but doesn't eliminate the odds) of getting Covid. Wearing the mask prevents the Covid-sick from giving Covid to the non-Covid sick and that is all the wearing of the mask does.
The Covid virus, I think, lasts for 10 days if the area where the Covid virus resides isn't sanitized. That means one can get Covid from an, at most I think, 10-day-old Covid virus.
Wearing the mask doesn't protect the eyes. Wearing the mask doesn't protect the hands. Wearing the mask doesn't protect the ears. Wearing the mask doesn't protect the head. Wearing the mask doesn't force anyone to socially distance.
Sidenote: I can also prove that the CDC/WHO is more concerned with saving hospital resources than saving lives, if you're interested.
That's one reason why determining if the CDC/WHO's Covid strategy works by examining number of Covid deaths is an apples to oranges comparison since the CDC/WHO is only concerned with saving hospital resources.
That's another reason why the Covid epidemic persists and why lockdowns persist: because the CDC/WHO is more concerned with saving hospital resources than saving lives. I guess, the CDC/WHO isn't aware that governments can manufacture hospital resources out of thin air!