The so-called eruption cyst, which occurs mostly on the third molar, is dentigerous cyst, arising at a late stage of tooth development. The authors have treated a dentigerous cyst occurred in angle region of the left mandible in 27-year-old woman who has complained of the facial asymmetry, by means of enucleation of the cyst in tis entirety and tooth removal, and resulted in a fairly good prognosis.