Eligibility criteria
bleeding, teeth
BLEEDING, CHRONIC PERIODONTITIS
Participants had to be in good general health, be at least 18 years, have an acceptable oral hygiene level according to the Simplified Oral Hygiene Index (OHI-S),Patients with severe or chronic periodontitis (teeth with probing pocket depth more than 4 mm with bleeding on probing and clinical attachment loss more than 3 mm in more than four teeth