When the roots of the teeth that need a root canal have died, the root turns a dark brown. The material of the dead root permeates the dentin surrounding it before the dead root is removed during the root canal treatment. The permeating of the dentin by the dead root causes the permanent discoloration of the tooth. In this case, you need to address the stain from the direction where the stain came from.
The technique involves removing the root canal filling that gives access to the canal and applying bleach mixture to the inside of the tooth. The bleach mixture will stay inside the tooth for often a week and then the process will be repeated until the tooth reaches the desired color. Here at Southview our teeth whitening procedure
usually takes 2-3 visits to reach the shade of the surrounding teeth but the amount of visits is determined by the color of the tooth in the beginning.