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Using baking soda is one of the oldest and best ways to whiten your teeth. Take your baking soda in a small container and mix it with water to make a paste type solution. Use it to brush your teeth and then follow up and rinse with peroxide and brush with toothpaste! Rinse your mouth out with 3% hydrogen peroxide solution every evening after you brush your teeth. 3% hydrogen peroxide solution is a mild bleaching agent so it can help to keep your teeth white, it is also very cheap; you should be able to pick up a bottle in your local pharmacy for less than $2.