I used crest whitestrips and I think it's normal that it goes away. If you want staying results you have to fork out the money for a proper cleaning and whitening!
I think the crest whitestrips do the money justice. And if you make it a part of your rutine it really isn't that hard to do at all. And they really do whiten the teeth and really get rid of coffee stains and such.
I think the crest whitestrips do the money justice. And if you make it a part of your rutine it really isn't that hard to do at all. And they really do whiten the teeth and really get rid of coffee stains and such.