Pre-eruptive intracoronal resorption is a rare disease defined as an intracoronal radiolucent lesion. Most are revealed through casual radiological examinations, and are clinically identifiable after eruption. The possible causes of lesions include congenital abnormalities, systemic fluoride uptake, external factors after tooth formation, and eruption of the tooth; however, no definite etiology has been found. Early diagnosis through regular examination is therefore considered to be the best diagnostic method. Treatment may differ depending on the size and progression of the lesion, but conservative treatment is recommended. This case report describes two cases where the lesions were accidentally found while performing a radiologic examination addressing other issues. It is the clinician`s responsibility to identify the size of the lesion and the expected eruption time, and to execute the appropriate treatment.