Earlier quoted context omitted.
I'm not an expert, but I believe they stop the droplets, which are vectors for viruses.
It has been proved that most of those masks sold simply aren't closely sewed enough to stop the droplets containing the disease. So in general the mask don't help. Secondly the mask only help avoiding spreading the virus from yourself to other and it doesn't protect from receiving the virus
Is that proven?
> Secondly the mask only help avoiding spreading the virus from yourself to other and it doesn't protect from receiving the virus
Doesn't this contradict your first statement? In fact the statement contradicts itself, stopping spreading the virus from one person to another by definition protects from receiving the virus.