susanto, Agus, Janti Rusjanti, Nunung Rusminah, Ina Hendiani, Ira Komara, and Prajna Metta. 2018. “The Prevalence of Chronic Periodontitis in the City of Bandung, Indonesia: A Cross Sectional Study”. International Journal of Medical Science and Clinical invention 5 (7), 3914-16. https://doi.org/10.18535/ijmsci/v5i7.04.