When taking a tooth shade for a crown, where should the shade be evaluated?

Shade selection is best performed with the shade guide held near the cervical third of the tooth because this region best represents the dominant shade of the natural tooth (the incisal is more translucent). Critically, the shade evaluation must be performed in natural daylight or a daylight-simulated light source, with the shade guide held outside the mouth next to the adjacent teeth. The dental operatory light is too warm (yellow) and can distort color perception. The eyes should be rested from bright colors beforehand.