When properly worn, medical masks won't make you breathe in too little oxygen or too much carbon dioxide

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When properly worn, medical masks won't make you breathe in too little oxygen or too much carbon dioxide
Medical masks, also known as surgical masks, are flat or pleated masks that attach to the head with straps or loops. Medical masks may feel uncomfortable if worn for a long time, but they won't make you breathe in too little oxygen or too much carbon dioxide.

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