evidence: The U.S. Centers for Disease Control and Prevention (CDC) recommends wearing masks if you choose to, and in specific places and situations. [...] - Don't put masks on anyone who has trouble breathing or is unconscious or otherwise unable to remove the mask without help. [...] Experts do not recommend using face shields instead of masks. It's not clear how much protection shields provide. But wearing a face mask may not be possible in every situation. If you must use a face shield instead of a mask, choose one that wraps around the sides of your face and extends below your chin.