Introduction. The success of root canal treatment influenced by four factors. Absence of pre-treatment periapical lesion, root canal filling with no void, obturation to within 2mm of the apex, and adequate coronal restoration. Inability to reach those conditions can lead to root canal treatment failure. Forming of chronic apical abscess is one of root canal treatment failure symptom. Non-surgical retreatment is still the main choice of root canal failure management with high success rate. The aim of this case report is to evaluate non-surgical retreatment as a management of previously treated tooth with chronic apical abscess. Case reports. A 21 years old female patient presented to the conservative dentistry clinic in RSGM Prof. Soedomo complaining about a broken lump with pus in her anterior region gum. Fistulograph was taken and showed that apical abscess formed in right maxillary central incisor that undergo root canal treatment 2 years ago with underfilling obturation and inadequate coronal restoration. Non-surgical retreatment has done followed with direct composite restoration. Three months observations were made to see the healing of the periapical tissues. Conclusion. Non-surgical retreatment can be chosen as a management in previously treated tooth with chronic apical abscess.