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We report on two undiagnosed horizontal root fractures of two maxillary right central incisors in two different patients caused by dental trauma which occurred several years ago. These fractures were discovered during a routine full-mouth radiographic examination. While, in case one, the fracture was located in the middle-third of the root, it was in the cervical-third of the root in case two. The fractured teeth were observed to have healed spontaneously without any sign or symptom, and tested as vital to electric pulp test.