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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 them?” 
Blood-borne viruses (BBVs) are transmitted by blood or other body fluids containing virus. This happens when the blood or fluids enter into the body or onto the mucosa of a susceptible person. I had never worn a mask with the intention of minimizing respiratory viral infections because they have been proven to be ineffective against respiratory viruses. Viral resp ....

Michael Hargadon , Becky Akers , Ben Swann , Baltimore Cancer Research Center , Reverse Isolation , Air Flow , பென் ஸ்வான் , பால்டிமோர் புற்றுநோய் ஆராய்ச்சி மையம் , தலைகீழ் தனிமைப்படுத்துதல் , அேக ஓட்டம் ,