A doctor based in Dublin, Ireland, made a video showing him wearing six face masks to set the record straight on masks and their impact on oxygen levels.
Read the full story: http://ctv.news/UqGAAYV



Subscribe to CTV News to watch more videos: https://www.youtube.com/ctvnews

Connect with CTV News:
For the latest news visit: http://www.ctvnews.ca/  
For a full video offering visit the CTV News Network: http://www.ctvnews.ca/video  
CTV News on Facebook: https://www.facebook.com/CTVNews  
CTV News on Twitter: https://twitter.com/CTVNews  
Watch CTV News on Twitter: https://twitter.com/WatchCTVNews  
CTV News on Google+: https://plus.google.com/+CTVNews/posts  
CTV News on Instagram: https://instagram.com/ctvnews/  
CTV News on Pinterest: https://www.pinterest.com/ctvnews  

---
CTV News is Canada's most-watched news organization both locally and nationally, and has a network of national, international, and local news operations.