Due to the long-term loss of posterior teeth and the supraerupted antagonist teeth, the vertical restoration space of the missing teeth is insufficient, which affects the implant restoration. In the past, the vertical restoration space of the missing teeth was restored by irreversible and invasive grinding of the supraerupted antagonist molar or crown restoration after root canal treatment. With the improvement of people's living standards and the aging of the population, the number of implant patients is increasing year by year. Therefore, the demand for molar intrusion of adult patients before planting is also increasing year by year. More and more patients are beginning to seek relatively non-invasive and efficient methods of molar intrusion. In recent years, with the development of orthodontic technology, the method of micro-implant anchorage has the advantages of relatively non-invasive and safe, and is more and more widely used in clinical practice. This article will review and summarize the commonly used methods of orthodontic-assisted intrusion of elongated molars, intrusion efficacy, and retention after intrusion, so as to provide a reference for clinicians, as well as select the appropriate intrusion scheme according to the specific conditions of patients.