Does what it's supposed to do!
This chewable dye product leaves a purple or pink color on plaque (depending on if it's old plaque or new forming plaque). Reading the other reviews that said it could stain the sink, I spit mine into a cup. But I did end up getting a few drops on the sink and it did not stain. I think it depends on the type of sink counter you may have. A regular porcelain or marble sink top should not stain (unless there's some chips or scratches in it that leave it exposed). It's easy to use. I do recommend one good rinse before you look in your mouth to rinse off the excess. And your tongue may stay purple for a few hours so I recommend doing in the evening.
Rating: 5 stars