The aim of this randomized, controlled, prospective clinical trial is to evaluate the performances of two different universal adhesives and an etch&rinse adhesive in restoration of non-caries cervical lesions. Twenty patients will receive restorations. Lesions will be divided into 7 groups according to adhesive systems and application modes: GSE: Gluma Universal- self etch, GSL: Gluma Universal-selective etching, GER: Gluma Universal-etch&rinse, ASE: All Bond Universal- self etch, ASL: All Bond Universal- selective etching, AER: All Bond Universal- etch&rinse, SB (Control): Single Bond2+etch&rinse. Restorations (nano-hybrid composite) will be scored with regard to retention, marginal discoloration, marginal adaptation, recurrent caries and post operative sensitivity using modified USPHS criteria after 48 months. Two examiners who is not involved in the placement of restorations will conduct the evaluations. Descriptive statistics will be performed using Chi-square tests.

Inclusion Criteria:

Inclusion criteria will be as follows:

1. being 18 years or older,
2. having no medical or behavioral problems preventing then from attending review visits,
3. having at least 7 tooth with NCCLs (d) having antagonist teeth.

Exclusion Criteria:

Exlusion criteria will be:

1. poor gingival health,
2. uncontrolled, rampant caries,
3. bruxism,
4. removable partial dentures,
5. xerostomia.