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Child’s brushing thoroughness and engagement while using the Smart E-Toothbrush at week 1 and week 4. Brushing thoroughness: 1 = much improved, 2 = somewhat improved, 3 = unchanged, 4 = somewhat worse, 5 = much worse. Engagement: 1 = strongly agree, 2 = agree, 3 = neither agree nor disagree, 4 = disagree, 5 = strongly disagree.
