Class V carious lesions will be restored using two different restorative materials either Resin modified glass ionomer or nanohybrid resin composite lined by PRG barrier coat. Each restoration will be evaluated for clinical parameters after finishing and polishing at baseline, at 6 months, 12 months and at 18 months. The restorations will be clinically examined according to modified USPHS criteria in terms of retention, marginal adaptation, marginal discoloration, secondary caries and postoperative sensitivity.

Class V carious lesions will be restored using two different restorative materials either resin modified glass ionomer or nanohybrid resin composite lined by PRG barrier coat.Each restoration will be evaluated for clinical parameters after finishing and polishing at baseline, at 3 months, 6 months, 12 months and at 18 months. The restorations will be clinically examined according to modified USPHS criteria in terms of retention, marginal adaptation, marginal discoloration, secondary caries and postoperative sensitivity.

Inclusion Criteria:

• 18-60 years Males or females. Patients with untreated cervical carious lesion that need restoration. Participants available for recall Patients with moderate to high caries risk

Teeth Inclusion Criteria No spontaneous pain Absence of tooth mobility

Exclusion Criteria:

• Patients with para-functional habits Experience with allergic reactions against any component of used materials. Teeth Exclusion Criteria Non-vital teeth Teeth with orthodontic appliance Teeth with advanced periodontal diseases.