T S, G K, malaiappan S. PREVALENCE OF GINGIVAL HYPERPIGMENTATION AMONG OLDER INDIVIDUALS MORE THAN 40 YEARS OF AGE . Psychosocial rehabilitation [Internet]. 2019 Dec. 3 [cited 2025 Oct. 17];23(6):978-92. Available from: https://www.psychosocial.com/index.php/ijpr/article/view/6683