Y-Kelin Indicator: Is The Plaque not easily to visible & remove?. With a simple use of this smart tool, you can instantly detect hidden plaque that may be lurking in your mouth. How to Work: The unique formula on the sheet reacts with plaque, turning it a bright purple color, so you can easily see where it is and how much you have.Now, you can zero in on problem areas and make sure you're getting the best clean possible.
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