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What is Black Triangles' act as a source of plaque accumulation and flossing interference, this should be treated by: and explain in detail?
Black Triangles’ can be treated by:

Filling the entire embrasure space with pink porcelain.
Andrew's bridge system
Increasing the connector height

Loss of residual ridge contour may lead to unesthetic open gingival embrasures (“black triangles”), food impaction and percolation of saliva during speech.