Angularis nigra

The interdental papilla does not fully enclose the space, leading to an aperture between adjacent teeth.

[2] Interdental "black triangles" were rated as the third-most-disliked aesthetic problem below caries and crown margins.

[citation needed] Possible treatments to correct angularis nigra include addition of composite resin in the space,[4] veneer placement, or gum graft.

[5] Angularis nigra is generally only treated based on the aesthetic preference of the patient[6] (although serious gum recession may warrant periodontal treatment).

The increased distance between inter-proximal contact position to bone crest, example to that is the naturally occurring diastema.