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Children’s general experience with the Smart E-Toothbrush app at week 1 and week 4. App helpfulness: measured on a scale of 1–5 (1 being not helpful at all and 5 being extremely helpful). App easiness and game enjoyment: measured on a scale of 0–10 (0 being not easy at all or did not enjoy games at all and 10 being extremely easy or enjoyed the games a great deal). The dots in the figure are outliers.
