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A device-independent colour model with three axes: L* (lightness), a* (red–green) and b* (yellow–blue). Because it does not depend on a camera sensor, it is the standard for measuring tooth colour objectively and comparing scans over time.
Why dentists measure in CIE LabOne photo gives you a whiteness score, a VITA shade match and a visible stain estimate — the vocabulary in this glossary, applied to your teeth.