http://www.youtube.com/watch?v=5aFUHTObV60endofvid [starttext] To remove surface stains, whitening toothpaste may include abrasives to gently polish the teeth, and/or additives such as sodium tripolyphosphate to break down or dissolve stains. When used twice a day, whitening toothpaste typically takes two to four weeks to make teeth appear more white.
[endtext]