A middle-aged female patient underwent root canal treatment at an outside hospital a year ago for a painful lower left posterior tooth, which split a day ago after eating. Why would the doctor recommend a full crown restoration after root canal treatment? However, not all teeth after root canal treatment require full crown restoration. The standard of a good dentist is to make the best treatment plan for you to maximize the preservation of the affected tooth. (PS: Don’t trust any one-and-done solution.)