"Ghost teeth" — regional odontodysplasia: markedly thin enamel/dentin with wide pulp chambers.

Regional odontodysplasia (ghost teeth) is a rare, localized developmental anomaly affecting several adjacent teeth in one quadrant (often anterior maxilla). Radiographically the enamel and dentin are so thin that the teeth appear faded or "ghost-like" with large pulp chambers. The affected teeth often fail to erupt, have open apices, and are prone to infection.