what can be done to make your teeth whiter and bigger ?
Whitening Your Teeth with Hydrogen Peroxide. 1  1. Use hydrogen peroxide. 2  2. Purchase a bottle of hydrogen peroxide from your local drugstore. 3  3. Use a mixture of the hydrogen peroxide and water as a mouthwash.  4. Brush your teeth with a hydrogen peroxide and baking soda paste once a week. This mixture will help keep your teeth looking white and clean. Here's how you can make it: Pour 2 teaspoons (10ml) of hydrogen peroxide into 3 teaspoons (15ml) of baking soda. Mix these together until a paste forms.