Mouth breathing: Masks reduce the amount of airflow available for breathing and most people compensate by mouth breathing within their mask. Most persons do not engage in mouth breathing on a normal basis. Mouth breathing can cause your mouth and throat to dry out, causing discomfort and tooth decay as the normal balance of saliva and its antimicrobial effects is disrupted.
Answered 6/21/2020
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Respirators: I was only able to find this info on KN95s masks : The FDA banned faulty masks from 65 overseas manufacturers. There is more data about N95 respirators with some studies showing decreased blood oxygen level & increased headaches. REF: https://www.jpost.com/health-science/could-wearing-a-mask-for-long-periods-be-detrimental-to-health-628400
Answered 6/20/2020
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Yes: To compensate, stop what you are doing periodically and rehydrate.
Answered 6/22/2020
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