The purpose of this study is to determine if a topical, adhesive patch (PeriZone PerioPatch) applied to the gums after a deep tooth cleaning (scaling and root planing) reduces the signs of advanced gum disease (chronic periodontitis) more than the deep tooth cleaning alone. Eighty patients with advanced gum disease will be recruited and treated within this clinical trial. Patients will be evaluated for changes in gum measurements over a 12-week period.

Objectives: 1) to evaluate the efficacy of PeriZone PerioPatch (FDA approved device, 510K number K103054) in reducing pocket depth (PD) in subjects with moderate to severe chronic periodontitis; and 2) to assess the effect of PeriZone PerioPatch on secondary clinical outcomes associated with chronic periodontitis including bleeding on probing (BOP), clinical attachment level (CAL), Gingival Index (GI) and Plaque Index (PI).

Participants: A total of 80 participants with generalized moderate to severe chronic periodontitis will be recruited for this clinical trial.

Trial Design: This study is a multicenter, randomized, single blind, and controlled design trial with two parallel arms. The 2 arms of the study are:

• Arm A - Scaling and root planing plus PeriZone PerioPatch;
• Arm B - Scaling and root planing alone (control group).

Procedures (methods): After potential patients have been screened, informed consent forms are signed, and patients have completed the remaining screening evaluations, each patient will be randomized to a treatment group. Patients must present with generalized, moderate to severe chronic periodontitis defined as having at least two periodontal pockets measuring 6 mm or more and bleeding on probing (at Baseline).

Periodontal probing measurements (PD, CAL, GI and PI) will be performed at Baseline (prior to randomization), and at Weeks 4, 8 and 12. All subjects will receive scaling and root planing (full mouth during at most 2 sessions within two weeks following the Baseline exam). Thereafter, PeriZone PerioPatch will be dispensed to subjects per randomization for administration over the trial period (i.e., Days 1-6; Days 14-20; Days 28-30; Days 42-44). Intraoral soft tissue inspection will be performed at Screening, Baseline and at Weeks 4, 8 and 12. Adverse event collection will be performed at Weeks 4, 8 and 12. Compliance will be will be evaluated via collection of unused study devices.

Analysis Plan: Baseline and demographic data will be summarized by treatment. Adverse events and safety outcomes will be categorized by treatment and summarized with descriptive statistics. Changes in probing depths, bleeding scores, clinical attachment levels Gingival Index and Plaque Index scores (from Baseline) will be expressed as means per subjects and tested for inter-group differences using nonparametric rank analysis of covariance.

Inclusion Criteria:

• Adult males or females 18 years or older
• Able and willing to follow study procedures and instructions
• Must have read, understood and signed an informed consent form
• Present with at least 12 teeth in the functional dentition, excluding third molars
• Generalized, moderate to severe chronic periodontitis
• Present with at least two periodontal pockets (on separate teeth) measuring 6 mm or more and that bleed on probing

Exclusion Criteria:

• Gross oral pathology
• Chronic treatment (i.e., two weeks or more) with anti-inflammatory medications (steroids or nonsteroidal anti-inflammatory drugs) or any other medications known to affect periodontal status (e.g., phenytoin, calcium antagonists, cyclosporine and coumadin) within one month of the screening examination
• Antibiotic treatment within 3 month prior to the screening examination
• History of rheumatic fever, valvular disease, valve replacement or prosthetic joint replacement necessitating antibiotic prophylaxis
• Active infectious diseases such as hepatitis, human immunodeficiency virus (HIV) or tuberculosis
• Reported allergies to herbal products
• Taking herbal product supplements
• Severe unrestored caries or any condition that is likely to require antibiotic treatment over the study
• Periodontal therapy (quadrant or maintenance scaling and root planing and/or periodontal surgical therapy) within 6 months prior to enrollment.
• Female patients who report being pregnant or lactating, or female patients who are of childbearing potential and who are not using hormonal, barrier methods of birth control (e.g., oral or parenteral contraceptives, diaphragm plus spermicide, condoms), or abstinence