What is a medical face mask? The medical face mask can be used as a barrier to airborne infections. By covering mouth and nose, the escape of viruses, germs and bacteria can be minimized. It is a disposable medical product that is attached to the head by elastic ear loops or constrictions. The mouth and nose mask consists of three layers, with the filter layer being enclosed by two outer layers. The surgical mask (also known as nose and mouth protection) has an adjustable nose clip for a high level of comfort and a good fit.