Objective: To determine the effect of health education on menstrual hygiene management in adolescents. Methods: The quasi-experimental study was conducted from April to July 2021 in Sampit, Kalimantan, Indonesia, after approval from ethics review committee of the Nursing University of Airlangga, Surabaya, East Java, Indonesia. The sample comprised grade VII female students at a public junior high school in Sampit. The sample was divided into intervention group A and control group B. Group A was given a health education intervention through video conferences in two meetings and was given a leaflet after each meeting which lasted 90 minutes. The control group was only given a leaflet. Baseline and post-intervention data was compared. Data was analysed using SPSS 16. Results: There were 70 subjects; 35(50%) in each of the two groups. The age range was 12-14 years, with 25(71.4%) subjects in group A and 28(80%) in group B being aged 13 years. The age of menarche was 12 years for 17(48.6%) subjects in each of the two groups. Knowledge level of group A increased significantly post-intervention (p<0.05), but group B showed no significant difference (p=0.144). Conclusion: Health education on menstrual hygiene management was found to have a beneficial influence on knowledge and attitudes among adolescents. Keywords: Adolescent, Hygiene, Menstruation, Health education, Health knowledge, Attitudes, Practice.

Introduction: According to the Indonesian Demographic and Health Survey (IDHS) in 2017, young women (63.9%) in maintaining cleanliness during menstruation are still lacking due to low knowledge and information about personal hygiene during menstruation. SMP Negeri 1 Sampit is located in Central Kalimantan where most of the students do not have knowledge about menstrual hygiene management. Methods: The activities used in this community service program were in the form of health education to 120 students of 7th and 8th grades. The community service events carried out through this webinar include opening, pretest, giving material, and closing with a post test. The pretest was carried out before giving the material to determine the participant's initial understanding of menstrual hygine management. Results: Knowledge related to adolescent growth and development scored well as many as 19 people (15.83%) then during the good posttest it became 63 people (52.50%). Knowledge related to menstrual hygiene management during the pretest who got a good score was only 20 people (16.67%) and 72 people (60%) good in posttest. While the knowledge related to mood disorders in adolescents who got a good score at the pretest was 21 (17.5%) and 70 people (58.3%) had a good score in posttest. Conclusion: Community service activities conducted in the form of online webinars to provide health education and modules to teachers can improve knowledge and practice of menstrual hygiene management as an early effort in maintaining and caring for the health of the female reproductive organs.