Recently, nanofill composite materials have been developed. These materials use submicrometer particles nanofillers to further enhance the optical and physical properties of the resins. Nanofilled composites have been recommended to be suitable for both anterior and posterior restorations by manufacturers in their product advertisements, although their longterm clinical performance and color stability are yet to be known and proved. Further, studies that evaluate the discoloration properties of nanohybrid composites are severely lacking, such that limited dental literature is available to provide guidance on selection of nanohybrid resin composites for clinical usage.