The dentigerous cyst arises from the dental follicle of an unerupted tooth. It is the second most common odontogenic cyst after the radicular cyst. A dentigerous cyst often involved mandibular third molars, maxillary canines, maxillary third molars and mandibular second premolars. They are most frequently in patients between 10 and 30 years old. It may cause tooth impaction or migration. This report presented a case of seven-year-old boy who had a swelling of maxillary right primary molar area combined with apical abscess. The radiograph showed migration of the developing premolars. The primary molars were extracted and marsupialization was performed which resulted in a complete resolution of clinical symptoms, spontaneous eruption of premolars and no sign of recurrence. This case demonstrated that marsupialization therapy can be used in preserving a cyst-associated tooth and promoting spontaneous eruption of the involved tooth. It can be considered as a treatment option in similar cases.