Used in combination with powdered activated charcoal and toothpaste. But from what I've read, you don't want to put charcoal on a good toothbrush (like my Sonicare). That's why I ordered these. And I can't tell if they matter or not (regarding the lightening). I can say that I received 6 toothbrushes for a very good price. And they will mask the black spots.
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