Hydrogen peroxide and baking soda make a good team: Peroxide is a cleaning agent and baking soda neutralizes odors. That's why many toothpaste products include either baking soda, peroxide or both. An at-home mixture of baking soda and peroxide can make a good substitute for toothpaste. If you're planning to use the mixture for toothpaste, just add a drop of peppermint oil to improve the taste.
Pour 1/4 tsp. of hydrogen peroxide into a mixing bowl.
Slowly add 1 tsp. of baking soda to the hydrogen peroxide. If you're making toothpaste, the mixture should be a paste-like consistency.
Continue stirring the baking soda and peroxide until mixed thoroughly. Add more peroxide or baking soda, as needed.
Use hydrogen peroxide sparingly to avoid accidental poisoning.
Contact the American Association of Poison Control Centers, if large amounts of peroxide come in contact with your eyes or lungs.