Amazon
16 Colors: A1, A2, A3, A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, D4 Use to compare teeth tones before and after whitening Professional 16 Color Guide with Laser Engraved Numbering
16 Colors: A1, A2, A3, A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, D4 Use to compare teeth tones before and after whitening Professional 16 Color Guide with Laser Engraved Numbering