From the Dentist’s Mouth Given those credentials, his opinion on masks should carry a ton of weight: Surgical masks have been worn by health professionals, to protect against cross contamination of Blood-borne viruses, not Respiratory viruses. Having worked as a microbiologist, or a dentist, throughout my professional career, I am very familiar with wearing a disposable surgical mask. I wore one to minimize the cross contamination of body fluids or tissues. This has been a concern due to blood-borne viruses. Some people ask, “If masks don’t work, then why do medical personnel wear t...