Patient came to the clinic complaining of mild biting pain in the region of teeth 43 and 44. On clinical examination, pain on palpation and percussion test in that region. Radiographic examination showed unsatisfactory endodontic treatment and diffuse periapical radiolucent image on teeth 33 and 34. The periapical diagnosis was then symptomatic apical periodontitis. Desobturation, PDT and Bio C Temp medication placement was performed on both teeth. The patient only returned 3 months later, when it was observed radiographically the repair of the area and then the filling was performed. Case performed by Jonas and Marcela, students of the Specialization in Endodontics of APCD Bragança Paulista.