Inclusion Criteria:  Subjects who has aged ≥ 60 years old. Subjects who not receive periodontal treatment within the previous 6 months. Subjects who are able to read Thai and express verbal communication. Subjects who are functional independent older adults (get ≥ 12 points from Barthel Index for Activities of Daily Living) [50, 51]. Subjects who are cognitive functional independent older adults (get > 23 points from Thai Mental State Examination) [52].  Exclusion Criteria:  Subjects with completely edentulous area. Subjects who require antibiotic prophylaxis for dental examination