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"The limitation of these masks is that they dont fit tightly around the mouth and nose and thereby allow potentially infectious particles to float around the edges." Waleed Javaid, MD, director of Infection Prevention and Control for the Mount Sinai Health System in New York City, and professor of Infectious Disease at the Icahn School of Medicine at Mount Sinai, tells Shop TODAY that surgical masks are fine to wear in certain situations

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They act as barriers, preventing the whitening gel from evenly contacting the enamel