The attributes and characteristics of medical beauty require doctors to add and guide aesthetics in the process of medical beauty treatment. At present, the public aesthetic evaluation criteria for the aesthetics of mandibular margin are difficult to effectively guide clinical treatment. In order to provide a more scientific, standardized and efficient aesthetic standard for the construction of exquisite mandibular margin, combined with the diversity of indications and complexity of causes of mandibular edge problems, based on contour aesthetics and three-dimensional construction, a new aesthetic standard of "three sides, two corners and one inflection point" is proposed. With the help of this standard, the aesthetics of mandibular edge can be effectively improved, and it has positive guiding significance and reference value in the clinical treatment of mandibular edge construction and overall facial contour improvement.