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Introduction: Brushing teeth is an important thing to do since it is one of the factors that affect oral hygiene, especially to remove plaque on the teeth.1 The ability to brush teeth properly and correctly is a fairly important factor in maintaining dental and oral health, especially in adolescence.5 The purpose of study to explain the differences in plaque scores before and after toothbrushing training using Bass technique in adolescents Method: The sample were 100 students aged 12-15 years old in grades 7, 8 and 9. This study design was experimental quasi and using a pre-test and post-test after 7 days to determine the difference in plaque scores before and after the training. The plaque index method that used to examine oral hygine was Patient Hygiene Performance (PHP). Comparison between plaque scores before and after training evaluated using Wilcoxon test. Result: Examination of PHP index before training shows 81 samples (81%) in poor criteria, then most subjects undergoes improvement after training. There were 94 samples (94%) experienced decrease or improvement in plaque score whilst 6 samples (6%) did not show improvement after training. Median of plaque score before training was 4.3 (0.2-5 (SD=0.502)) afterwards improved to 2.2 (0-4.8 (SD=0.496)). Wilcoxon test obtained a value of p

Module is a complex teaching material that allow students to learn independently. Qualified module is produced through validation stages. Validation is a very important process in teaching material development so that it can be used practically and effectively. This study aimed to determine the validity of the training module of PowerPoint optimization as a learning media. The type of this research is Research and Development with 4D model (Define, Design, Develop, and Disseminate). Research data is the result of expert evaluations regarding product validation such as content validity, construct validity, and language validity. Validation is a sequence of activities at the development stage. In conducting validation, it must also be ensured that the instrument used to assess the product is also valid to avoid bias when evaluating the product. Validation data were analyzed using Aiken’s V. The results of the study showed that the module developed was in the valid category with the average of Aiken’s V coefficient > 0,6 therefore, it could be used at the trial stage.