Uncommon developmental abnormalities such as fused or geminated teeth are of interest for the clinical problems associated with them. A rare case of fusion between maxillary primary central and lateral incisors and a supplemental incisor occurring bilaterally is presented. The patient was a 4-year-old Thai boy. Intraoral examination revealed an abscess and fistula in the region of the fused teeth as a result of periapical osteolysis. Access cavities were prepared as acute procedures. Because of the unpromising prognosis, surgical removal of the teeth was inevitable. For functional, esthetic, and phonetic rehabilitation, an acrylic denture was incorporated.