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Clinical measurements were obtained by two calibrated examiners. A data\u2010driven approach to model selection with Akaike information criterion (AIC) was carried out via multilevel regression analyses and partial regression plotting for changes in the level of the gingival margin over time and interactions with the early (6\u2010month) results of soft tissue phenotypic modification.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>One\u2010hundred and fifty\u2010seven treated sites in 83 patients were re\u2010assessed at the long\u2010term recall. AIC\u2010driven model selection and regression analyses demonstrated that 6\u2010month keratinized tissue width (KTW) and gingival thickness (GT) influenced the trajectory of the gingival margin similarly in a concave manner; however, GT was the driving determinant that predicted significantly less relapse in the treatments, with stability of the treated gingival margin obtained beyond values of 1.46\u2009mm.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Among a compliant patient cohort, irrespective of the rendered therapy, the presence of at least 1.5\u2009mm KTW and 1.46\u2009mm GT was correlated with the long\u2010term stability of the gingival 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