Yuzar, Yessi, Lisnayetti Lisnayetti, and Nurul Amelia. 2018. “The Difference Plaque Index of Brushing Teeth A Combination to Grade Students”. Jurnal Kesehatan Masyarakat Andalas 12 (1):44-48. https://doi.org/10.24893/jkma.v12i1.377.