Activated charcoal on its own might not be safe and effective for tooth whitening, but the charcoal in Black is White toothpaste is specially formulated.
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Activated Charcoal Teeth Whitening Powder with Bamboo Toothbrush - 50g Natural Coconut Charcoal, Effective Teeth Stain Remover and Toothpaste Alternative - Safe for Gums Or Enamel : Health & Household
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