These plaques definitely show plaque and my kids use them once a week to show me how well they brush their teeth. Dark spots show old plaque, while light pink spots show new plaque or food debris. WARNING: If your kids don't wash the sink or are dirty little hobbits like mine, you may end up with pink colored china. Ask your kids to use this under supervision, not because the product itself is dangerous, but because it will stain your countertops and sink. Only for that 4 instead of 5 stars.
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