A root canal procedure involves removing the diseased or damaged dental pulp from the pulp chamber, which is located in the center of a tooth. The dental pulp contains nerves and blood vessels. Sometimes, some of the blood vessels and nerves may not be completely removed. If any blood remains, it may lead to the discoloration of the tooth. This does not affect the health of your tooth. However, but people are concerned about how these areas look.

The tooth can be lightened using either a whitening procedure at your dentist's office, or a product you can buy at a grocery store or drugstore and use at home. However, this solution may not be permanent, because the dark areas are still inside the tooth. For a permanent solution, your dentist can remove the filling that was placed during the root canal procedure and clean out the pulp chamber again. Then, the tooth can be whitened until it is the same color as the other teeth.