@Henry Chung: Well, these are some of the reasons why cracked teeth are frustrating. You sacrifice predictability of optimal outcomes for an attempt at saving the tooth. Unless the patient is very clear about this it can lead to frustrated patients and loss of confidence. BTW, you can upload your x-ray of the case by adding an attachment to your reply. Persistence of symptoms after endo in a molar may be due to the crack but may be to a number of other possibilities as well. It’s hard to presume without seeing a post operative radiograph.