Non-vital or Internal Bleaching. The single dark tooth.
Why is my tooth dark? A single dark tooth possibly indicates that the tooth might need a root canal because it has a dead nerve giving the tooth a darker gray/brownish hue. Discolouration might also be present in a tooth that had had a root canal treatment done many years ago, using older techniques, material and cements.
The patient should see an endodontist for a consultation to determine if the tooth can undergo a procedure called “non-vital bleaching” to restore the colour to a more natural colour. This procedure requires the endodontist to re-enter the old root canal to activate strong chemicals “inside” the tooth to whiten it. This is an “in-office” visit, not to be confused with over the counter dental bleaching, which is whitening from the “outside.” Tooth discolouration can also be a sign of nerve damage or death, in which case, doing a root canal and non-vital bleaching is all that may be needed to restore the tooth.