How long will Root Perfection last? July 15, 2022 20:51 Updated The color will last until it grows out and the client is ready to retouch their roots in approximately 3 weeks. Related articles Can I process Root Perfection longer than 10 minutes? How is Root Perfection different from Radiant Cream Color? What is recommended if the gray did not cover? The color went too dark. Why? How do I select the right shade of Root Perfection to use?