Whiten Teeth in a Day and Keep Healthy Gums Brush with Baking Soda. ... Use Hydrogen Peroxide. ... Use Apple Cider Vinegar. ... Activated Charcoal. ... Powdered milk and toothpaste. ... Coconut Oil Pulling with Baking soda. ... Essential Oils Whitening Toothpaste. ... Turmeric Whitening Toothpaste.