Background / Aim. The biggest motivating factor for undertaking of orthodontic treatment is poor dental aesthetics, as a consequence of occlusal abnormalities. The aim of this study is to determine the need for orthodontic treatment on the basis of aesthetic componentsof IOTN index (the index of orthodontic treatment need), to compare the degree of aesthetic component of IOTN and subjective perception of individuals about their dental aesthetics, and to compare the evaluation of the aesthetic component of IOTN subject in comparison with evaluation of the therapist. Methods. The study was conducted on a sample of 316 students, age 15-19 years old, who were not in orthodontic treatment prior to the survey. The research was done by the usage of the index of orthodontic treatment need (IOTN)which consists of dental and aesthetic components on the basis of which the need for therapy is determined. The aesthetic component of the index was noted by the therapist (specialist of orthodontics), as well as subject himself. Results. According to grades of subjects the need for orthodontic treatment is present with 0.38 % of male subjects and 2.00 % of female subjects. According to evaluations of the therapists, the need for orthodontic treatment is present in 7.52 % of male subjects and 8.00% of female subjects. Observing all subjects , the need for orthodontic treatment is present in 0.63% of subjects, and according to the therapist the need for orthodontic treatment is present in 7.59% of subjects. The mentioned difference is statistically significant. Conclusion. Obtained results show that there is a significant difference about the dental aesthetics and the need for orthodontic treatment between the subjects and therapists. This can be a cause for concern, because patients who are not aware of their orthodontic abnormality can limit the need for further treatment.