Since Sweden's honor at stake here ...
Well, we do now and they're right yet again.
https://nypost.com/2020/08/19/swedens-tegnell-wearing-face-masks-may-be-very-dangerous/
“It is very dangerous to believe face masks would change the game when it comes to COVID-19,” said Tengell ...
Tegnell has argued that evidence about the effectiveness of face mask use was “astonishingly weak.”
“
I’m surprised that we don’t have more or better studies showing what effect masks actually have,” he told the UK Times.