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This study evaluated the effect of resin composite restorations of non-carious cervical lesions (NCCLs) on the occurrence/progression of gingival recession (GR), considering different tooth isolation techniques. A randomized controlled split-mouth and blinded trial was carried out. Patients (n = 38) with at least two NCCLs were included. Before the cervical restoration placement, the NCCLs (181 teeth) were randomly allocated into two treatment groups according to the tooth isolation techniques cotton roll or rubber dam. Experienced, trai