The purpose of this case report is to present the treatment of immature necrotic discolored permanent incisor with the use of apical plugs of mineral trioxide aggregate (MTA) for apexification and walking bleach technique to remove discoloration. With this technique, MTA mixture is used to create an artificial stop against which to condense gutta-percha in pulpless teeth with open apices. The report of this case confirms that MTA acts an apical barrier and can be considered as an effective material to support regeneration of apical tissue in immature necrotic teeth. The present article reports the successful bleaching of discolored non-vital, endodontically treated tooth with good prognosis