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The A1–D4 shade system dentists use, organised by hue (A red-brown, B red-yellow, C grey, D red-grey) and chroma. A1 is the lightest tab; a shade match is expressed as the closest tab.
The VITA guide decodedOne photo gives you a whiteness score, a VITA shade match and a visible stain estimate — the vocabulary in this glossary, applied to your teeth.