The face mask is an option for the correction of skeletal anterior cross bites due to maxillary hypoplasia in infant
patients that are growing and present primary or early mixed dentition. This maxillary traction is possible
because the craniofacial complex is very malleable and Potpeschnigg (1875) was the first to develop the idea
of maxillary traction; later Delaire at the end of the 60's renewed the interest of the use of the face mask for maxillary protraction, which was created to correct the posterior rotation of the maxilla and its development deficiency for the treatment of cleft lip and palate patients, Petit at the end of the 70's proposed the use of this appliance for patients with skeletal Class III patients that needed maxillary protraction. Petit modified the basic concept of Delaire, changing the anatomy of the face mask, he also increased the magnitude of the generated force exerted by the appliance and also reduced treatment time.