Tip: If you don't want to buy a purple toothpaste, you can also mix 1-2 drops of purple food coloring in with 1 Tbs. of your regular toothpaste like TikToker @studioseela did in her video below.

"I love the Crest 3D white Brilliance Toothpaste ($20, for a pack of three)," Dr. Goldman says. "Still, if you're looking for true dental whitening, a professional treatment is usually the best ...