Dentigerous cyst may be developmental or inflammatory in origin. The latter is found only in mixed dentition with a low frequency. Treatment of inflammatory type of dentigerous cyst in children should be done with the aim of saving developing permanent teeth which should not be sacrificed as far as possible. This is a case report of a large inflammatory dentigerous cyst in a 10-year-old female patient treated conservatively by marsupialization method saving all teeth (mandibular permanent left canine, first and second premolars) in relation to the cyst.