The little chart is surprisingly sturdy and the shades are spaced clearly enough that I can finally tell if my whitening strips are actually doing anything. I snapped a photo of my teeth against it on day one and comparing weekly has been way easier than guessing in the mirror.
Elizabeth J.★★★★★
I've been using this shade guide every few days since I started whitening, and it's honestly made the whole process way less guesswork. The card sits flat against my teeth and the color range is clear enough that I can actually tell I've moved up a shade.
Edward M.★★★★★
I was honestly dreading that my whitening strips weren't doing anything, but holding the guide up to my teeth after two weeks showed a clear two-shade difference. The printed colors match real-enamel tones closely, and the little cutout makes it super easy to compare without awkwardly squinting in t