The health implications due to wearing these ridiculous reusable face nappies will only start to show in a few weeks: they won't stop a virus - either in or out. But they will trap bacteria. Bacteria that multiplies by DOUBLING every twenty minutes in ideal conditions (moisture laden air at room temperature.) So that lovely flowery face nappy contaminated with just one bacterium in the morning, will be hosting over SIXTEEN MILLIONS, in 8 hours.
To the disbelieving - get a calculator and work it out. But of course - you won't be contaminating it with just one bacterium - it'll be thousands, so you're talking BILLIONS in the course of a working day, if you wear it all day.
But even if you don't - even if you just wear it for an hour to pop to the shops, whilst it's in your pocket/handbag/sitting on a shelf, that multiplication will continue, so the next time you wear it, you'll be exposing yourself to an increased level of bacteria. And you'll be touching it, fiddling with it - as everyone who wears these things do. You'll also be touching - and contaminating - things in shops, which will be picked up by others, so even if you're fortunate enough for your mask not to be contaminated by other's Streptococcus pneumoniae / Staphylococcusaureus (and many of us host these bacteria in our noses and skin) the longer you wear it, the greater the risk of auto inoculation (infecting yourself with your own bacteria.)
So - a message to all silly face nappy wearers ... Unless you wear a disposable face nappy and change it every two hours, you need to check if your life insurance covers you against bacterial pneumonia. (Of course, if you are unfortunate and die, it'll be put down as 'Covid - not tested' as most of the deaths attributed to this virus have been.) Expect to see a large increase in hospitalisations due to - it will be lied - Covid-19. But the treatments will be with anti-biotics such as azithromycin/clarithromycin etc., so you'll know what you're suffering from, in reality.