N95 masks will also limit the spread from someone who is actually infected, too. So the masks will, when used correctly help limit all spread and I am not sure why you say "not really".
But I should add, the CDC only recommends face masks for the infected and limits recommendation of N95 respirators to healthcare providers and those in workplace settings.
But I should add, the CDC only recommends face masks for the infected and limits recommendation of N95 respirators to healthcare providers and those in workplace settings.