Here's an all natural teeth whitening recipe that I've been doing which has been working like a treat! Catherine Zeta Jones and Tyra Banks are known to do this also...
Here's what you need:
1/2 teaspoon of baking soda
1 ripe strawberry
Now, mash the strawberry and mix it in with the baking soda. Apply the mixture to your teeth with a soft tooth brush and leave it on for about 10 minutes. Then, brush your teeth and rinse! I do this once a week and it sure keeps me smiling!