Disturbances during morphodifferentiation of tooth germs are rare in the permanent dentition. Reasons for abnormalities are: trauma (fighting, falling, any sport activity) occurring during the eruption; mechanical blockage of the path of eruption by neoplasms; cysts; supernumerary teeth; therapeutic irradiation of the area; and orthodontic treatment. Abnormalities are classified as dilaceration, extra root formation, double root formation, concrescence, rizomegali and hypercementozis. In this article, three different root abnormalities are presented.