10 Best Face Masks for Virus Protection Reviewed & Rated 2020
Jan 03, 2021·To close this gap, pinch the metal band in the mask that is located at the bridge of your nose so that it will take the shape of your nose. This will close off the gap at the top of the mask. Length of Use – Medical masks and dust masks are usually just one-time use only. Medical masks are just usable for three to four hours.