Published on behalf of SIDO, the Italian society of Orthodontics, “The Phenomenon of Low Friction Techniques: State of the Art” features the contributions of the major experts worldwide on the self-ligating technique. It is in fact an international work, entirely in English language authored by Alan Bagden, Claudio Cimenti, Lars Christensen, Giancarlo Cordasco, Felice Festa, Arturo Fortini, G. Battista Garino, David Suārez Quintanilla e John Valant, beside Giampietro Farronato (editor) and Alberto Laino (SIDO president in 2006-2007).For the first time very interesting cases treated with low friction biomechanics are reported from the beginning and with all the intermediate steps as well as their long term follow up. But what are the weak points of Low Friction technique? Whact clinical advantages justify its use?“The Phenomenon of Low Friction Techniques: State of the Art” makes more clear the clinical and scientific meaning of this fascinating and stimulating treatment opportunity, which is captivating the attention of te whole orthodontic world thanks to its advantages in vitually any type of malocclusion, even severe,and dentoalveolar crowding avoiding tooth extractions.