Aim and Objective: To study the prevalence of eruption of third molar tooth among Rajnandgaon (Chhattisgarh) population by observing the presence or congenital absence of third molars among them and to analyze the percentage of impacted third molars using OPG.

Materials and Methods: 350 Indians aged between 16 to 26 years old were examined for the presence or absence of the third molars. To confirm the congenital absence of third molars using Orthopantomograms (OPG).

Results: The results were analyzed for both maxillary and mandibular third molars showing insignificant interobserver bias. It was noted that only 43% of males and 59% of females have congenital absence of third molar, and 49% of males and 32% of females have erupted third molars. 16% of males had partly impacted third molar whereas in case of female it was 26%. Congenital absence of third molars among females was 15% more than in males. Frequency of agenesis of third molars is more in maxilla than mandible. More males had impacted third molars than females. It was also noted that majority of them have their maxillary third molars erupted first before their mandibular third molars.

Conclusion: It was concluded that maximum mandibular third molars had erupted before maxillary third molars. More males had impacted compared to females according to our study.