I wondered if teeth whitening toothpaste really works. I bought the Crest 3D PROFESSIONAL toothpaste that states your teeth will be whiter in 3 days. As soon as I got home from Sam's Club, where I bought the toothpaste, I ordered this shade guide kit from Amazon. It came the next day. It is now a month later and my teeth are 6 shades whiter!!!!!! It is just good to know that THIS teeth whitening toothpaste actually works because I have tried many teeth whitening toothpastes in the past and none of them seemed to work. This Teeth Shade Kit lets you know if your teeth whitening product is really working. The case is really nice with a mirror inside. The actual teeth guide is easy to use. The teeth are number with the even numbers from 2 - 40. If you are between two shades, you are the odd number. I am very happy with my purchase and would recommend it to anyone who wants to monitor teeth whitening products to see if they are worth the money. Some teeth whitening products don't work and MOST are overpriced.greatPerfect for body sculpting business and teeth whitening business.Helps me so much with identifying what shade my clients have and how much of a difference they can see after a session! Definitely worth the moneyAt first I was like $50!!!!! But I guess that’s just what we have to pay. I thought it would be cute to put my business logo on itAwesome! Just like the pics and description. I use this shade guide for my mobile teeth whitening business. I love that it comes in a cute little carrying case and has a cleaning wipe.Some of the shades are really close in color so it can be hard to differentiate between a few when tracking the shade for a client. Overall it gets the job done. I am please and will most likely order more when I expand my services.It is great , I actually like this and the shipping was fastIt’s super nice it does the job I’m in teeth whitening and it helps me so much with milt clients worth the money