DO YOU WANT TO WHITENING YOUR TEETH?

How to

Mix baking soda with water or lemon (they both work fine).
In a small cup, mix half a teaspoon of baking soda with a few drops of either water or lemon. 
Be sure it is a paste, this way it will be easier to apply. 
For applying the paste to your teeth you can use a toothbrush or just your fingers. 
If it is a bad stain you want to remove, it's recommended you apply the paste directly to the stain and let it set for about two minutes. 
Just like with doing the dishes, some stains need a little extra scrubbing. 
This can also be the case with the stain on your teeth, use a toothbrush or your fingernails to scratch away that last bit of dirt.
For a better result you can dry the tooth surface with a gauze before applying the paste.
If you want an overall whitening effect, dip your toothbrush into the cup, to cover the bristles with the baking soda paste and start brushing.
Alternatively, you can dip a wet toothbrush directly into some baking soda, and the powder will attach itself to the bristles; however, the taste of the baking soda will be very strong if you use this method. 

You'll notice result within two weeks..