1 To give your teeth a whiter appearance, mix 1 teaspoon of baking soda with enough water to achieve a creamy paste. 2  Use this paste to brush your teeth, then rinse and brush again with your toothpaste. Comments. Everybody dreams of having pearl-white teeth, without stains or plaque. Most people think that dentists and expensive teeth whiteners are the only way to achieve it. Wrong! If you wish to restore your beautiful and bright smile, read below and discover 3 fabulous ways to naturally make your teeth whiter.