How Bonding Responds to Color
Teeth whitening products and procedures provide an effective, simple way to remove stains caused by foods, drinks, and habits over time. Teeth-staining culprits include juicy and colourful berries, tomato-based sauces, coffee, tea, caffeinated soda, and red wine, not to mention smoking and chewing tobacco.
Trying to whiten bonded teeth, however, is a different story.
The colour of the bonding resin and porcelain is designed to match your natural tooth colour. Once they are bonded to your natural teeth, only dental professionals should be able to tell which teeth are bonded.
Unlike tooth enamel, though, bonding resin is nonporous. On your natural teeth, stains form when the staining agents penetrate your teeth's pores, and whitening agents penetrate the surface of your teeth to whiten them.
The nonporous nature of resin prevents whitening agents from penetrating them. As a result, your resin-bonded teeth can look stained or discoloured in certain areas due to the contrast with your bleached natural teeth. Like any plastic item, resin can become discoloured over time when exposed to various staining agents.
Simply put, bonding resin can appear stained, but you can't whiten it with tooth-whitening products.