No, it turns the bacterial plaque on your teeth blue. That lets
you see how well you are brushing.
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The blue plaque commemorating Bram Stoker is located at the Royal Hotel in Whitby, England. It marks the spot where Stoker stayed while he was inspired to write his famous novel "Dracula" during his visit to the town in 1890.
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plaque
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I went to the dentist and he removed the plaque from my
teeth