A 2021 study backs this up. Researchers came to the conclusion that teeth brushed with charcoal toothpaste over a 12-week period not only appeared to have “no clinically acceptable whitening ...
These pastes get their name from their vibrant purple tint. “Purple toothpaste works by using purple dye to neutralize any yellowish stains or coloration on the teeth,” explains Rhonda Kalasho, DDS of ...
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