The internal resorption in this case was quite aggressive, but not perforating externally. It is always fascinating to see how much of tooth destruction happens in these cases. Even after cleaning up the soft tooth structure, the underlying hard dentine keeps flaking away and continues to have “bleeding points”. Munce burs are quite useful in cleaning up the altered dentine. By the time I cleaned up till there were no more “bleeding points”, there wasn’t much tooth structure left coronally. I put a fiber post to give some strength coronally. I treated this case before I was aware of Trichloro acetic acid (TCA).