When managing traumatic dental injuries (TDIs) to the primary dentition, it is essential to consider the close relationship between the apex of the primary tooth root and the developing permanent tooth germ. Several consequences ranging from hypoplasia to eruption disturbances of the permanent successor teeth have been described. 1 Guidelines have been produced by the International Association of Dental Traumatology to assist dentists in managing TDIs in the primary dentition and minimizing the impact on permanent successor teeth. 1 Unfortunately, untreated TDIs in the primary dentition may lead to long-term adverse sequelae which necessitates future complex treatment, including endodontic, restorative and/or orthodontic therapy in the mixed and permanent dentitions. Dentigerous cysts (DCs) are benign odontogenic cysts associated with the cervical region of an unerupted tooth that envelops the crown. 2 Approximately 75% of DCs are associated with unerupted third molars, with the peak incidence in the second to fourth decades of life. 2 Although traditionally defined as being of developmental origin, multiple case reports have described DCs forming seemingly in response to chronic periapical inflammation associated with primary teeth. 3-5 Therefore, DCs may potentially develop as a consequence of untreated TDIs to the primary dentition. As DCs are usually asymptomatic, they may become extensive, resulting in the displacement of the associated primary and/or permanent teeth. 2 Consequently, to prevent or limit the severity of such complications, clinicians should be aware of the potential undesirable sequelae of untreated TDIs in the primary dentition and facilitate appropriate, timely management.