Aim The aim of this retrospective study was to determine the frequency of hypodontia, hyperdontia, invagination, impaction, dilacerations, peg-shaped lateral incisors, taurodontism and short or blunt and narrow or pipette-shaped roots in Croatian orthodontic patients. Material and methods 506 orthopantomographs and study casts from 12-16 year-old orthodontic patients treated at the Department of Orthodontics, School of Dental Medicine University of Zagreb were analyzed. Results At least one dental anomaly was present in 24.1% of patients, and more than anomaly in 1.2% of them. The frequency was not significantly different between genders. Hypodontia was the most frequent anomaly with the incidence of 7.5%, followed by teeth impaction with the incidence of 6.3%. Conclusion The distribution and the prevalence of anomalies were similar to those described in the general Croatian population.