Dentists used that to cut down on covid in patients they had to work on. Crest, Colgate and others have that In them in some varieties of their mouthwash
...Dentists...
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Back in the ancient days of my youth, dentists used an iodine mouthwash. Can still recall the smell/taste of the stuff. They didn’t have the spritzing devices, the patient had to swish and rinse repeatedly during the procedures. There was even a little sink with running water to flush it attached to the chair.
Haven’t thought of any of that in years.