Improvements in tooth-coloured restoratives and bonding technology have made dental procedures more palatable and feasible. Patients are attracted to a restoration that matches the color of natural teeth. Resin composites meet this demand and have become the most frequently used esthetic material in dentistry. In addition, resin composites avoid the mercury controversy, and bond to tooth structure by using adhesive systems. Composite restorative materials represent one of the many successes of modern biomaterials research, since they replace biological tissue in both appearance and function.