The toothpaste may remove surface stains since charcoal is mildly abrasive, but in order to fully whiten teeth, a product must work on stains on and below the enamel, Healthline notes.
According to Harpers Bazaar, removing stains from the surface (which are called extrinsic stains) is common with toothpaste that is designed to remove stains. However, whitening teeth includes going beyond surface stains to deeper stains (which are called intrinsic stains) that come from within the tooth, and these stains can only be removed from treatments that penetrate below the surface level.
"I recommend a charcoal toothpaste to remove surface stains but not to whiten teeth," cosmetic dentist Gregg Lituchy told Harpers Bazaar. "It is difficult to actually whiten a tooth with any toothpaste, but those with charcoal do remove surface stains effectively."
The toothpaste may also be too abrasive to brush your teeth with every day, Healthline says, as it can ultimately can wear your enamel down and later lead to greater exposure to stains — which can result in yellow teeth.
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