After undergoing whitening with the DaVinci Teeth Whitening System, teeth shades will brighten up to 14 shades, with an average improvement of five to eight shades with each 20 minute session. Individual results will depend on your current tooth shade, treatment time, and the composition of your teeth. Your end result will be a whiter, healthier smile. Everyone’s teeth are different and will have a natural stop point. We recommend a 60 minute session for optimal results and to remove all layers of staining.