Relationship of skin complexion with gingival tissue color and hyperpigmentation. A multi-ethnic comparative study by Pradeep Koppolu, Haifa Almutairi, Safa al Yousef, Nisren Ansary, Mohammed Noushad, Mantri Bharath Vishal, Lingam Amara Swapna, Nouf Alsuwayyigh, Malak Albalawi, Deepti Shrivastava, Kumar Chandan Srivastava

“…Materials and methods A total of 839 subjects were involved in the study where the gingival color and skin tone were measured using the Dummett-Gupta Oral pigmentation Index (DOPI) combined with VITA VMK MASTER and skin shade method developed by Revlon (USA) and L’Oreal (France) for makeup foundation shades. …”
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