In Group IIIA, immediately after bleaching and rinsing, the labial surface of each specimen was treated with 10% sodium ascorbate for 10 minutes and then rinsed. This was followed by composite build up similar to Group IA using Prime & Bond NT adhesive system. In Group IIIB, immediately after bleaching and rinsing, the labial surface of each specimen was treated with 10% sodium ascorbate for 10 minutes and then rinsed. This was followed by composite build up