I worked in dentistry for 40 years! Masks should NOT be worn for more than a couple of hours. It can protect from certain things but not all things, including viruses! We wore them because we were inches from peoples faces. If we sneezed or coughed, we couldn’t use our hands to cover our faces, as we had gloves on. The patient didn’t wear makes!!!! Same in surgery, patients , Dr wears mask , not patient. And when the patient is gone, we removed our masks. Anything that the patient may have had remains in the air!
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