The Relationship Between Oral Hygiene Knowledge and Oral Hygiene Status of The Elderly In The Periodontia Specialist Poly RSGM UNAIR. International Journal of Advanced Health Science and Technology [Internet]. 2025 Sep. 20 [cited 2026 Mar. 31];5(5):221-7. Available from: http://ijahst.org/index.php/ijahst/article/view/539