Gigi Hadid does it. Selena Gomez and Amanda Seyfried do, too. Olivia Munn also used to apply toothpaste to her pimples but has since wised up to this acne treatment hack. The stars, they’re just like ...

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 ...