I am very pleased with this product. I see a noticeable difference just after 2 uses. This Shine whitening kit is well packaged, easy to use and works very well. The mouth trays are made of high quality material, I've seen others that didn't last through the first use. I would recommend this to anyone. I especially love not worrying about bleaching my teeth with peroxide, as this has none. I was pleasantly surprised with the taste and overall feel. I am also very happy about not having tooth sensitivity after use.