The general operation time can be finished in about 30 minutes, while the complex operation takes about one hour. It can be illustrated from different aspects, as follows: 1, the front teeth area has a better vision, it is easy to operate, and spends relatively less time; while the back teeth area has a restricted vision, it is difficult to operate, and spends more time; 2, the number of teeth: the surgical operation of a single tooth is relatively fast, and the operation of multiple teeth will surely take more time; 3, the purpose of the treatment: the general surgical operation will be faster, and for the treatment with Aesthetic requirements and other special requirements of the treatment, its design will be complex, the operation will take more time; 4, surgical cooperation: the operator alone will spend more time, with other doctors or nurses, assistants with the operation of the operation is convenient, clear vision, the time spent will be less. If the patient cooperates smoothly, the operation time will be less, if the patient is nervous and the degree of mouth opening is limited, then the operation time will be longer.