A modification of the Millard rotation advancement technique for repair of complete unilateral cleft lip has been used in our medical centre for the past six years. We developed this geometrically justified technique based on our experience treating many patients in our department. Based on the analysis of pre- and postoperative face casts of each patient, as well as based on the comparison between patients and controls, we found that our technique achieved excellent cosmetic results, giving a natural-looking lip.