Background: The Index of Orthodontic Treatment Need (IOTN) is one of the important index to find out orthodontic need of patients. Aim: To find out the need of orthodontic treatment in patients visiting Nishter Institute of Dentistry, Multan (NID).

Method: The index was applied using plaster models and intraoral examination. The measurements of various components of IOTN index was taken with the help of digital vernier calliper.

Results: The results of various measurements of IOTN index was taken, recorded and analyzed statistically. Result of the present cross-sectional study showed that 65% patients were in grade 4 and 5 of IOTN. The analysis showed that 13% were in grade 4 of IOTN, 52% were in grade 5, 15% were in grade 3, 16% were in grade 2 and 4% patients was in grade 1 of IOTN index.

Conclusion: No significant sex differences were shown for the need of orthodontic therapy in any category of IOTN. The need of orthodontic treatment is very high in patients of Southern Punjab, Pakistan.

Keywords: Treatment Need; IOTN; Orthodontics.