This clinical study was sponsored by Mansoura University. According to the records, the research project is officially completed. The investigation focused on Class V non-carious cervical dental lesions. The work evaluated the behavior of resin composite restorations applied to these specific tooth lesions. The primary evaluated intervention was dentin pretreatment using dimethyl sulfoxide (DMSO). This method was compared against a control approach where no dimethyl sulfoxide was utilized.