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The systems below have been shown to whiten teeth effectively. I personally have tested them. However I feel the best results are obtained by simply enhancing the natural crystalline structure of the enamel with the nano-hydroxyapatite products in my daily protocol. It fills in microscopic cracks and defects minimizing staining, makes the enamel surface slick and smooth, and creates a white opaque layer that blocks incoming light and reflects back white light. The smile above is mine - a 69 year old who is an avid coffee drinker!