The Relationship Between Tooth Brushing Methods and Gum Bleeding Among the Elderly at Posyandu Lansia in Surabaya . International Journal of Advanced Health Science and Technology [Internet]. 2024 Aug. 12 [cited 2025 Aug. 16];4(4):257 – 260. Available from: https://ijahst.org/index.php/ijahst/article/view/380