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However, the mean differences were minute to notice clinically. Age difference did not have any effect on the treatment changes. RPFM revealed treatment outcome with more protruded upper lip than RTB. RPFM revealed treatment outcome with more protruded upper lip than RTB. The aim of this study was to evaluate the protective effect of using four different fluoride bioactive enamel sealers against an acidic erosion challenge. A sample of 50 freshly extracted sound upper premolars had their buccal surface bonded to 50 orthodontic brackets us