Works as well as Crest whitening strips
I noticed a difference after the second use.  I've been drinking too much coffee over the past year or so and needed something to whiten my teeth.  These were much more affordable than the crest strips though I've used those in the past.  My experience was that these worked just as well.  I'm extremely pleased with the results and plan to repurchase in the future.
Rating: 5 stars