 A randomized controlled split-mouth and blind trial will be carried out. Patients with at least two non-carious cervical lesions NCL will be selected. NCL will be randomly assigned according the type of teeth incisors, canine or pre-molars into two groups: control or experimental group application of 2 CRX for 60 seconds after the acid etching procedure. Class V restorations will be performed out with an etch-and-rinse adhesive system Adper Single Bond 2-3M ESPE and a composite resin Filtek Z350-3M ESPE according the manufacture instructions, by previously trained operators. The restorations will be evaluated by a calibrate examiner at 1 week baseline, and 6-month, 12-month and 24-month, using the World Dental Federation FDI criteria. The outcome is retention of the restoration. 