Amount of Cementum After Scaling, Root Planing and Glycine Air Polishing

Inclusion Criteria: * systemic factors (no systemic diseases; no medications affecting periodontal status in the previous 6 months; no pregnancy or lactation; * behavioral factors (no smoking habits); * dental and periodontal factors not to have had previous periodontal therapy; no class III dental mobility; * a periodontal probing depth (PPD) ≥ 4 mm in at least two sites per tooth with single rooted ; * have no caries or restorations on the mesial and distal surfaces and bleeding on probing. Exclusion Criteria: * systemic diseases; medications affecting periodontal status in the previous 6 months; pregnancy or lactation * smoking habits * have caries or restorations on the mesial and distal surfaces and bleeding on probing. * have had previous periodontal therapy; class III dental mobility;