HRi dentin shades are highly fluorescent and designed to work with HRi enamel shades for desired results. One or two dentin shades are all that is needed to get the desire results. In nature, the dentin mass transmits its hue and chroma through an enamel mass, which completely surrounds the underlying dentin. This is exactly how a tooth is restored with HRi. 
If you are frustrated with spending precious time to produce a high level esthetic composite restoration, only to be disappointed in the result, it's not your fault. With traditional layering techniques, it's a hit-or-miss process. Popular enamel composites produce a graying effect as they are applied in thicker layers, because their refraction index is not tuned to human enamel. The only way they achieve results is through a complicated and unpredictable layering technique. Even if successful under certain lighting conditions, these restorations are subject to metameric failure.
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