“…Although gingival bleeding was measured in most of the studies, it was tested using different indices depending on the study, which created a disparity of clinical criteria for assessment and precluded the unification of data [ 21 , 22 , 23 , 26 , 27 , 28 ]. As for plaque control, 4 studies tested it using the Plaque Index (PI) [ 23 , 24 , 25 , 26 ], although 2 of them [ 25 , 26 ] did not provide numerical data. Concerning clinical attachment level, although it was measured in 3 of the studies [ 21 , 22 , 28 ], that by Sparabombe and colleagues [ 22 ] did not explain the measurement criterion, which means that it was discordant with the measurement units used in the other 2 studies.…”