I've used this religiously for 1 week and have not ...

I've used this religiously for 1 week and have not noticed a difference in the whiteness of my teeth. I will use all four pens and update my review. I'm changing my review from 2 to 4 stars. This does work but it works very slowly. I am definitely noticing after almost 2 weeks that my teeth are whiter. The trick is to dry your teeth before applying and try to keep you lips away from your teeth for as long as you can so that the product can dry on your teeth. Do this right before going to bed to get the best results and with persistence and patience you will see a result.

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