Selecting the shade of an anterior esthetic restoration is NOT advised when?

Selecting the shade of an anterior esthetic restoration is not advised immediately after cavity preparation due to the changes in the tooth's appearance and the surrounding environment. After a cavity preparation, the tooth structure often appears dehydrated and can be lighter in color, leading to an inaccurate shade selection. The process of cutting into the tooth can cause a temporary alteration in the appearance of dentin and enamel, which may not represent the final color after the restoration is placed and the tooth is rehydrated.

In contrast, selecting the shade with natural light and a moist environment provides a more accurate representation of the tooth's natural color, as wet teeth reflect light differently than dry teeth. The application of a rubber dam can also interfere with shade evaluation, as it isolates the tooth and may eliminate the influence of surrounding colors. Engaging the patient in the shade selection process is beneficial, as their input can help ensure satisfaction with the esthetic outcome; this involvement can result in a more personalized approach to the restoration's final look.