Widhani FDP, Nosartika I, Kusuma IA, Prabowo YB. Relationship between Knowledge of Periodontal Disease and Gingival Melanin Pigmentation and Smoking Behavior. eG [Internet]. 2022 Feb. 3 [cited 2024 Nov. 24];10(1):24-31. Available from: https://ejournal.unsrat.ac.id/v3/index.php/egigi/article/view/37333