Dentigerous cyst is a cyst arising by a seperation of follicles from around the anatomical crown of an unerupted tooth within the jaws. The dentigerous cyst is seen during routine radiographic examination. It is detected radiographically as a sharply delineated, round or oval, unilocular, homogeneous, and radiolucent area within which there is the crown of an unerupted tooth. The histological appearance of the dentigerous cyst is usually attached to the tooth at the cementoenamel junction and the sac lined by a thin, regular. stratified squamous epithelium. The dentigerous cyst can be treated by two surgical procedures: enucleation or marsupialization. The size and location of the lesion usually dictates the surgical procedures. The marsupialization consists of the removal of only a portion of the wall of the cyst to make the remaining cystic lining continous with the oral mucosa. The cyst, deprived of its supporting hydrostatic pressure, gradually shrinks until it is obliterated. The marsupialization is the best way to conserve the tooth affected by a dentigerous cyst and to permit its eruption. especially in a young person. Main advantages of the marsupialization are its relative simplicity and its conservation with respect to adjacent important structures. In marsupialization technique, a plugger can be constructed, if necessary, to maintain the opening and prevent food debris from entering the cystic cavity. However, the disadvantage is the potentiality of leaving pathologic tissues. Therefore frequent recall appointments are advisable.