Periodontitis is a chronic, multifactorial disease primarily driven by the accumulation of bacterial deposits. Treatment involves the mechanical removal of the biofilm, traditionally performed by scaling and root planing (SRP). However, SRP is time-consuming and can cause irreversible damage to both hard and soft tissues as well as postoperative sensitivity. Consequently, adjunctive or alternative air-polishing devices have been developed. The objective of this study is to compare the clinical and microbiological efficacy of an erythritol-powder air-polishing device versus SRP in periodontal maintenance therapy.To evaluate patient-reported pain and treatment time for erythritol air-polishing versus SRP. A randomized clinical trial was designed and participants were randomly assigned to one of two groups: Intervention: Perio-Flow® (air + erythritol powder) and PIEZON PS®. Control: Ultrasonic debridement followed by SRP with Gracey curettes.At baseline and at six months, probing depth, clinical attachment level, and bleeding on probing were recorded. Saliva samples were collected to detect the most prevalent periodontal pathogens. Patient discomfort during treatment was measured by a visual analog scale, and procedure duration was timed.

Inclusion Criteria:

• Patients who have received basic periodontal treatment between 3-6 months before the study.

Exclusion Criteria:

• Pregnant or breastfeeding patients.
• Use of systemic antibiotics within 6 months prior to the study.
• Patients who smoke more than 10 cigarettes/day.
• Uncontrolled diabetic patients.