The cost of oral CT in a regular tertiary hospital dentistry department is about$450. CT can visualize the location of the inflammation, as well as the spread area of the inflammation and the three-dimensional structure of the tooth, and can thoroughly see the location of the inflammation, which is the ideal way to treat the tooth, and is also the way most regular hospital dentistry departments, take preoperative film, intraoperative film and postoperative film. Oral CT shows the patient’s teeth better and is usually a great aid for complex root canal treatment.