Baking soda and water makes a natural toothpaste that works great for cleaning teeth.
When you brush your teeth using baking soda you'll likely notice whiter teeth than you would with regular toothpaste however you should still brush your teeth at least once per day using toothpaste with the fluoride since the fluoride helps to strengthen your teeth.
For even better results with the baking soda toothpaste you can use Hydrogen Peroxide along with the Baking Soda to make the baking soda toothpaste instead of using the water.