There are a number of factors which can contribute to darkening or yellowing of teeth. Coffee, tea, or smoking are common causes, but other natural or dietary factors are frequently involved.
Bleaching is most effective when the stains are external. The type of bleaching pictured in this case is less effective when the stains are internal. ("Dead" teeth or teeth that have had root canal treatments sometimes develop internal staining. Internal staining is also seen in some adults who were treated with tetracycline early in their childhood.) There are other options for brightening internally stained teeth
Patient Photos Depicting:
Tooth Whitening
Note: Patients depicted in photos have provided their consent to display their pictures online. Results may vary.