Description: A 13 year old patient complaining of spontaneous pain on UR5 which required painkillers to control the pain. Vertical percussion test was negative. Sensitivity test was positive with pain lingering for more than ten seconds. X-ray seemed to show the full formation of the UR5 apex, however periapical radiography can give false information of the apical status and the average root formation of a second maxillary molar is at the age of 12-14 years old. Severe inflammation was found in the pulp chamber and partial removal of the pulp root was carried out, obtaining hemostasia. MTA was placed plus glass ionomer and final restoration was completed 3 months later.