similar to Group IB using Xeno V adhesive system. In Group IVA, immediately after bleaching and rinsing, the labial surface of each specimen was treated with 5% proanthocyanidin solution 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 IVB, immediately after bleaching and rinsing, the labial surface of each specimen was treated with 5% proanthocyanidin solution for 10 minutes and then rinsed. This was followed by composite build up