<b><i>Objective:</i></b> This study investigated the effects of a school-based vocal hygiene education program “Green Voice for School” on promoting knowledge of healthy voice use for primary school students. <b><i>Methods:</i></b> Thirty-nine grade 4 and 5 students from local primary schools participated in the “Green Voice for School” program. Students received 6 weekly vocal hygiene training sessions with the aim of enhancing their voice care knowledge. Their voice care knowledge was assessed by a 15-item questionnaire. Students’ voice care knowledge was examined before training, immediately after, and 1 year after completion of the program. <b><i>Results:</i></b> Students showed significant improvements in their voice care knowledge immediately after they received the vocal hygiene training sessions. Such improvements were maintained 1 year after the students completed training. <b><i>Conclusions:</i></b> The results suggest that “Green Voice for School”, a school-based vocal hygiene education program, can be effective in promoting long-term improvements of voice care knowledge in school-age children.

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