Discuss onkarpawar's answer to: Will Tooth Discolor After Root Canal Treatment?

No, with all the new materials and modern technology used during the procedure, your tooth should not discolor after the treatment. If you have a tooth that has had a root canal and it has discolored, it is best to have your dentist take a look. It may be that germs (bacteria) have penetrated underneath the old filling, and it is time for a new one.

Source: 

http://www.oracaredentalcentre.com/root-canal-treatment/452-will-my-tooth-discolor-after-root-canal-treatment.html

http://www.oracaredentalcentre.com/root-canal-treatment.html