The eruption cyst is an uncommon type of dentigerous cyst. It may be seen in deciduous or permanent dentition. Three cases of eruption cysts are reported and the subjects are discussed. Eruption cysts are associated with erupting teeth and are usually larger than dental lamina cysts, which is the main differential point between the two types of oral lesions. Eruption cysts can be seen to be different from the dentigerous cyst by the clinical features and dental radiograph surverys. Treatment of the eruption cyst is not always undertaken immediately. However, if necessary, the most common method used has been the removal of a portion of the tissue overlying the crown of the tooth to facilitate eruption.