SPSS (Version 24.0, IBM Corp., Armonk, N.Y., USA) was used for data analysis. Quantitative variables were checked for normality using Shapiro Wilks tests, histograms and QQ plots. Descriptive statistics were displayed as frequencies and percentages for categorical variables and means and standard deviations for quantitative variables. Independent t test or Mann Whitney U test (depending on normality) was used to assess differences in quantitative variables: age, number of decayed teeth, gingival index, plaque index, pain and satisfaction scores. Chi square was used for categorical variables: education level, brushing frequency and last dental visit. Friedman test used to assess change in VAS across time in each group. An intention-to-treat analysis was performed by assigning the worst pain and satisfaction scores to those lost to follow up using worst case scenario analysis. Significance level was set at P < 0.05.

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