BEST Teeth Whitening Homemade Product Works Wonders! Make your teeth snow white in 2 weeks! Put a tiny bit of your favorite toothpaste into a small cup (I use Crest Pro-Health Clinical Plaque Control), mix in 1 teaspoon baking soda + 1 teaspoon hydrogen peroxide & ½ teaspoon water. Mix well then brush your teeth for 2 minutes. Do it once a week until you have reached the results you want. Once your teeth are whitened, limit yourself to using the whitening treatment once every 1-2 months.