Four weeks after "Baseline" at visit 3 ("Treatment", consist of two appointments at intervals of 24 hours), periodontal parameters are examined and all subjects receive full mouth supra- and subgingival debridement in two sessions on two consecutive days. Debridement is performed with sonic scalers using micro tips under local anesthesia and polishing is performed with an air powder device. Subjects are instructed to abstain from oral hygiene for the next 24 hours. At the second appointment, plaque formation rate is examined, all subjects receive full mouth supra- and subgingival debridement, and are instructed to brush with their already used toothbrush for 2 minutes at least twice per day at home. Two months after "Treatment" at visit 4 ("Reevaluation", consist of two appointments at intervals of 24 hours) periodontal parameters are examined and all subjects receive full mouth supragingival debridement in one session. Subjects are instructed to abstain from oral hygiene for the next 24 hours. At the second appointment, plaque formation rate is examined, all subjects receive full mouth supragingival debridement. Subjects return the dentifrice packages.