Doctor demonstrates for dummies that even six masks don't lower oxygen intake

Irish doctor Maitiu O Tuathail got so sick of people claiming that surgical masks cause oxygen deprivation that he put on half a dozen while hooked up to an oxygen meter. Guess what happened?

He originally posted on Twitter:

Getting asked “Does wearing a face mask lower your oxygen levels” repeatedly by patients today! Based on what they are reading on social media *Face coverings / masks don’t reduce your oxygen levels!* I managed to get six face masks on + it had no effect on my oxygen levels!

Of course, the dim bulbs and conspiracy kooks who need to see this won't be convinced, but it's a valiant effort!

Image: YouTube / Maitiu O Tuathail via Storyful