The experimental group will receive oral hygiene instruction (OHI) and full-mouth scaling using standard rigid Gracey curettes (Hu-Friedy® Manufacturing Inc., Chicago, IL, USA) and ultrasonic instrumentation (EMS piezoelectric system, Electro Medical Systems, Nyon, Switzerland) at week 1-2 and at a second reinforcement visit at 6-8 weeks. Subjects will also be instructed to rinse with 10ml of Chlorhexidine 0.2% mouthrinse twice daily for 30 seconds for the duration of the study.

The control group will receive no periodontal treatment during the study. After completion of the study, these patients will be given oral hygiene instruction and a full mouth scaling.

Oral hygeine instruction and gingival scaling using hand and ultrsonic instruments.

Blood sample that measures fasting plasma glucose and the HbA1c level.

Blood sample to measure C reactive protein (inflammatory marker).