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[–] 16 points 3 days ago (6 children)

They're tablets used to highlight plaque / areas missed by brushing. Common tens of years ago in the PNW anyway, haven't really seen them in 10-15+ years though.

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  • [–] 7 points 3 days ago (5 children)

    Weird. Maybe a state-based thing? Never hard of them in the SW.

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  • [–] 5 points 3 days ago (3 children)

    You would have seen these only at the dentist. We had them in Oklahoma when I was a kid. (55 here.)

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