The goal of the present study is to compare the amount of root coverage resulting from subepithelial connective tissue graft and acellular dermal matrix associated with tunnel technique among patients suffering from multiple gingival recession.

Acellular dermal matrix with Tunnel technique will offers great advantages for patients with multiple gingival recession as regards decrease surgical time, Post-Operative pain and root coverage, clinical attachment level, width of Keratinized gingiva, gingival biotype compared to subepithelial connective tissue graft with Tunnel technique.

Inclusion Criteria:

• Subjects with facial multiple gingival recession defects classified as either class I or II defects according to Miller's classification (Miller 1985).
• Subjects aged between 18 - 60 years old.
• Patients should be free from any systemic disease that may affect normal healing of tissue, and predictable outcome.
• Patients with good oral hygiene.

Exclusion Criteria:

• Current and former smokers.
• Pregnant females.
• Subjects received any periodontal therapy for minimum of 6 months prior to the study.
• Subjects taking drugs known to interfere with wound healing.
• Subjects with unacceptable oral hygiene with plaque index >2.
• Teeth with non-carious cervical lesions (NCCL), cervical caries and malalignment.