Yes, this stuff really works ! You won't notice a huge change after the first use, but after a week, you'll notice that your theeth are whiter. It's a bit pricey (depending on where you live, between 30-60$) but it's worth the money if you wanna get whiter theeth !! You also need to be religious about this treatment : you can't do it 2 days, then stop doing it 1 week, and then start again. You need to do the treatment every day and you'll notice a huge difference after some weeks !!
I refuse to spend my money on whitening products because I never really see results. So I use baking Soda instead. Baking soda really works. I brush my teeth in the morning then brush it again with baking soda then to get rid of the texture and taste of it in my mouth I use mouth wash. The first time I used it I brushed with making soda for about 3 days straight and saw emmediate results. I had a dentist appointment and the dentist was very impressed and asked me if I brush my teeth twice a day, I said yes but since I'm lazy I really don't 😬 now I use it as needed maybe once a week.