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1: Line passing through the most cervical contact point. 2: Line bisecting the distance between lines 1 and 3. 3: Tangent to the apical-most aspect of the clinical crown. Below line 1: No papilla shown. Between lines 1 and 2: Moderate loss of papilla. Between lines 2 and 3: Mild loss of papilla. At line 3: Optimal level. Image credits: Feras Y. Dahhas.
