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Objective The aim of this study was to evaluate the efficiency of oxalic acid (BisBlock) on restorations of non-carious cervical lesions. Materials and methods One operator placed 90 restorations randomly divided into two groups in 20 patients under cotton rolls isolation: Control Group—two-step etch-and-rinse adhesive technique; and Experimental Group—two-step etch-and-rinse adhesive technique...