| Re: Plaque identifier
I may be dating myslef here but these have been available for at least 30-40 years as far as I know - usually they are given to young children when they are just learning how to brush properly. I remember using them when I was quite young. Unless they have changed the ingredients significantly I would assume they are safe - they are probably primarily made of a food dye that sticks to plaque due to it being "sticky" in and of itself.
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