In augmentation mammoplasty, the selection of placement for implants is based on the characteristics of each patient and the tissue conditions to ensure an optimal covering of these. The location must not be arbitrarily based on the preferences of the surgeon and the patient, but must ensure adequate tissue covering, thus minimizing shorts and long-term risks. Retromammary, retropectoral, and total and mixed retromuscular implants have been used. The retrofascia location of the mammary prosthesis reported in this article was described for the first time in the year 2000. This retrofascia technique refers to the collocation of the implant behind the fascia and in front of the pectoralis major muscle with the goal of achieving proper covering and good support of the implant. This is a nonrandomized prospective study investigated 110 cases of mammary hypoplasia and ptosis levels 1 and 2 from October 2001 to October 2002 with an average follow-up period of 1 year. Periareolar incisions were used in the retrofascia collocation of the mammary implant. The types of implants used included texturized silicone gel (85%) and smooth silicone gel (15%). As demonstrated by the findings, this surgical technique can achieve a good support to keep the prosthesis in an adequate position, maintaining the superior pole with a very natural projection. The incidence of complications was 7.6%, the most frequent of which was capsular contracture (3.53%).