Remember the trick of putting toothpaste on your pimples overnight, which purportedly dried out acne? This old-school tip is enjoying a resurgence as a skin hack on TikTok and other social media ...

“Using toothpaste for acne typically does more harm than good,” says S. Tyler Hollmig, MD, the director of laser and cosmetic dermatology at the University of Texas at Austin’s Dell Medical School.