The most common toothpaste ingredient is fluoride, which protects against cavities. Choose a toothpaste with calcium carbonate or hydrogen peroxide if you want to whiten your teeth. Avoid toothpaste ...

If you’ve never heard of tooth powder, you’re not alone. This age-old product was the precursor to toothpaste, but it fell out of favor decades ago. Even though it’s hard to find on store shelves, ...