https://www.reddit.com/r/askdentists/comments/102i28a/does_the_purple_foam_hismile_toothpaste_actually/
Does the purple foam Hismile toothpaste actually whiten teeth? : r ...
Jan 3, 2023 ... It doesn't actually whiten. It coats your teeth with a thin film of the purple color, which counteracts the yellow, making them look white, but ...