Expensive Product with Limited Whitening Results

I purchased Crestwhite teeth whitening strips with high expectations given the premium pricing. The product packaging is professional and instructions are clear enough to follow. However, my results were disappointing after using the full course of treatment. After two weeks of consistent use, I noticed only minimal whitening, perhaps one to two shades lighter. For the price of seventy-five dollars, this is underwhelming compared to professional dental treatments costing slightly more. The strips were somewhat uncomfortable to wear and occasionally caused sensitivity in my gums. Customer service was unhelpful when I inquired about refunds, claiming the product works differently for everyone. The marketing materials show dramatic transformations that I didn't experience. Alternative whitening products at half the price delivered better results in my previous experiences. The delivery was fast, which is the only positive aspect of this purchase. Ingredients list appears safe but effectiveness is questionable. I would not recommend this product to friends or family based on results. Better value whitening solutions exist in the market. This was an expensive waste of money that disappointed me.