Complete periodontal examination will be conducted at 6 sites per tooth for all teeth present at baseline and 3 and 6 months after periodontal treatment. The examination will be conducted by two examiners trained and calibrated. There will be measured Probing Depth , Bleeding On Probing, Periodontal Attachment Loss , Gingival Bleeding Index , Visible Plaque Index and the retentive factors of plaque.