It’s not uncommon for a tooth that has undergone a trauma to darken or become discolored. This is due to blood and other fluids leaking from the root canal to the dentin and enamel of the tooth.
While conventional teeth whitening is not successful in these cases, internal bleaching is. In this technique, an endodontist accesses the pulp chamber of the tooth, cleaning it out, sealing it, and placing a peroxide gel into the area. This gel is eventually absorbed into the inner layer, whitening the tooth from the inside out.