Alveolar ridge resorption after tooth extraction is frequent, clinically significant and makes the placement of an implant-supported restoration difficult. Different types of bone substitutes such as xenograft, allograft and hydroxyapatite have been used for ridge preservation. Tooth is a hard tissue with similar organic and inorganic compositions to bone, and thus it could be used as a potential bone graft substitute. In this case report, an autologous demineralized tooth matrix (DTM) was used to preserve and augment the alveolar bone after tooth extraction, before dental implant installation. After 3.5 months, the bone core was trephined for histologic analysis and the dental implant was placed. During the healing period, neither infectious occurrence nor unexpected clinical symptoms were observed. DTM demonstrated good soft and hard tissue contour maintenance. At the time of implant installation, the socket was completely filled with osseous tissue. A histological examination showed new bone formation and resorption patterns of the DTM particles. The clinical and histological findings suggest that filling an extraction socket with DTM is a good alternative for implant site preparation. The results of this case report confirm the resorption of the DTM over time and the formation of quality new bone at the graft site.