Face shields are a layer of clear plastic that is fastened at the forehead head-band style. The actual plastic covers your entire face and usually extends below your chin, says William Schaffner, M.D., an infectious disease specialist and professor at the Vanderbilt University School of Medicine. “A face shield provides a barrier for anything going out, but also for things going in,” he says. The way people in the general public use face shields can vary, Dr. Schaffner explains. Some take their cue from medical professionals and wear a shield on top of a mask; Others just wear a shield alone.
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