I found this product at the Dollar Store and thought what the heck for $1.25 and gave it a try. I could tell it was whitening within10 minutes. When I took them off after 30 minutes I was AMAZED! My teeth were way whiter. Since it was the product for sensitive teeth, I did one more treatment and my teeth are blazing white. I was amazed. One treatment would have been enough, fyi. I know I’ll never find them at this price again so wwent back to the Dollar Store today and bought five more packages.There are three treatments per box. There was regular and sensitive formulas. Since I used the sensitive I stuck with that. There was only one little spot in my lower gum that was sensitive. On the second treatment I used a wetted w-tip and wiped the gel off of my gum and that was all I needed to do. And the strips really stick to your teeth, too. I usually buy bleach from my dentist and use a tray. NO MORE!!!I swear I don’t work for the company or know any sellers. My teeth yellow easily but they also easily bleach. I think the people who complained this product didn’t work for them probably have naturally darker shaded teeth. I very much recommend this product if you know your teeth are “bleachable”