internal bleaching

Some teeth show discoloration after root canal treatment. Sometimes it is caused by necrotic pulp left in the chamber, which happened here with tooth #10. Few weeks of sodium perborate inside of pulp chamber, #10 is no longer gray and discolored.

I don't believe every single tooth should be crowned after root canal treatment. The process of stripping off the entire enamel layer, which is the strongest part of the tooth, does not seem to be minimally invasive to me. I agree that most of time, root canal treatment happens to a severely decayed or extensively restored tooth, which may fracture without a crown. There are few exceptions though. In this case, #10 has no other restorations, the root canal was probably done when patient was still very young, because the chamber was very large. If we prepare the tooth for full porcelain crown or PFM, we would remove the thick layer of enamel away, leaving a thin layer of dentin, and composite build-up on the inside. I don't see any other fracture or crack, at this time, I prefer to restore tooth with composite only.