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Those face masks with breathing valves? They aren't effective, doctors say

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Some mask mandates banned the use of masks with breathing valves, because they don't stop the spread of coronavirus.

      


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Those face masks with breathing valves? They aren't effective, doctors say Those face masks with breathing valves? They aren't effective, doctors say Reviewed by Qamar javed on July 23, 2020 Rating: 5

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