Background: This study was conducted to assess the incidence of gingivitis and periodontitis in patients undergoing fixed orthodontic treatment. Material and methods: In this study there were 100 patients who underwent fixed orthodontic treatment. The patients were informed about the procedure and were asked to give consent. the mean age of the subjects was 18.8 years. The subjects who were willing to give consent and those who were willing to participate in the study had been included while those who were unwilling to give consent and who did not want to participate in the study had been excluded. Intraoral examination of these subjects was carried out to assess the prevalence of gingivitis and periodontitis. Statistical analysis was conducted using SPSS software.Results:In this study, there were total 100 subjects, out of which 25 were females and 75 were males. In this study, 23 subjects had gingivitis and 32 subjects had periodontitis. Hence, the prevalence of gingivitis and periodontitis was 23% and 32%, respectively. Conclusion: The incidence of gingivitis and periodontitis was 23% and 32%, respectively.