Instead of replacing the stained restoration, bleaching could be considered.

This study revisited staining of some dental aesthetic materials, and the efficacy of 10% carbamide peroxide to reverse such staining. Nanocomposites were the most susceptible and surprisingly, conventional glass ionomers were the least susceptible to staining. Subsequent bleaching resulted in the greatest improvement of stained nanocomposites. This in vitro study was carried out on specimens of nanocomposite, microhybrid composite, conventional glass ionomer and resin-modified glass ionomer. Eighteen disc-shaped specimens were prepared of each material. These were subjected to a harsh staining regimen comprising immersion of each disc in either a solution of coffee, turmeric or tobacco for 3 hours for 45 days. The stained specimens were then bleached with carbamide peroxide. Colour changes over time were measured using CIE lab colour space system. Nanocomposites may be more susceptible to staining as a consequence as the methacrylate modified polysiloxane resin that has a higher hydrophilicity and water sorption, when compared with BIS-GMA.