A triangular extension of the free gingiva located interproximally between two contacting teeth. When viewed transversely, it resembles two peaks and a trough below the tooth contact area (interdental col). The structure of the gingival (interdental) papilla is dependent on the supporting alveolar bone and the integrity of the dental arch. Preservation of the papilla is important in aesthetic dentistry to avoid the appearance of a ‘black triangle’. Inflammatory necrotizing gingival conditions can result in the formation of an interproximal gingival crater.