Dr. Gualtiero Mandelli graduated in Medicine and Surgery from University of Study of Milan in 1985. After the graduation, he achieved three post-graduate specializations in: Orthodontics, Stomatology and Pediatrics in the same University. He was Visiting Professor in Orthodontics at University of Parma from 2003 to 2010 and from 2011 he is Visiting Professor at Specialization School in Orthodontics at University of Brescia. His private practice is in Lombardia. He is member of SIDO from 1995. Dr. Mandelli is also author of various scientific works and has given talks and presentations at numerous courses and congresses. In the last four years, he has dedicated his Orthodontic Biomechanics research, in particular, to the use of phase auxiliaries in order to increase the clinical efficiency of base set up in phase 1 and phase 2.