Dental CPITN: A Was observed for the first time by ADA in 1992 B Scored by a special periodontal probe of length 3 to 5 mm backward for easy visibility C Measure 6 representative teeth in young people D Score of '3' means the treatment involves oral hygiene instructions, scaling and curettage 💡 Explanation CPITN: ✓ Correct Answer: C. Measure 6 representative teeth in young people