I have seen a difference in my teeth in a week. My teeth looked brighter and whiter but not brighter by one whole shade. You need to use it 3times daily ( as mentioned on the pack) to get the full results. I did all this but it did not make my teeth 1 shade brighter.
However, yes, it does whiten the teeth to an extent. In addition, many types of toothpaste just work for a week and then the teeth starts to lose its whiteness. Nevertheless, with this one, teeth stay just as white as it was when you started using it. Use your mouthwash after using it and it will increase its capacity to keep your teeth bright. Overall, I am quite satisfied with its whitening ability.