I was skeptical to try this out because I know some people that have tried products like this and were not too satisfied....However, I didn't have the $300 plus to spend on professional teeth whitening so I thought, hey I'll spend $30 and try it out....Well to my surprise it worked beautifully! My teeth were verrrrry stained yellow and now they are beautifully pearly white....Not neon white, but at least 5 shades whiter and I'm still not done...I have about 7 strips to go....So happy I tried this out, I am definitely gonna do this again in 6 months....great product.