Was ever a foreword requested for God's words? It is not indecent to write a preface for Hugo's "Growing Mandible"? After training in the Jaw's Old Testament, Hugo is writing the New One that he taught for 40 years long. Indeed, the last decade has been fertile in mechanical gadgets which have made diagnosis and surgery easier, such as, accurate CT 3-D images, and absorbable plating or osteodistraction, which brings a fine touch to treatment timing in children. However, all of this does not encompass the intellectual process, basic principles, tactics and procedures.