Ectopic eruption is a disturbance in which the tooth does not follow its usual course. The purpose of this manuscript is to provide a brief review regarding the incidence, etiology, classification and different management techniques used for correcting ectopically erupting permanent first molar. The following manuscript further presents a case report for correction of ectopically erupting mandibular left permanent f irst molar by using a simple and effective appliance by the author.