Introduction: The study aims to compare the nutrient intake in adolescent urban Indian population undergoing fixed Orthodontic treatment and clear aligner treatment. Material & Methods: Forty adolescents (20 undergoing fixed Orthodontic treatment and 20 undergoing clear aligner treatment) aged between 12 and 18 years participated in the study. Before the treatment, the participants were interviewed, and their food consumption frequency and 24-hour retrospective food consumption records were taken. Participants were followed up for 12 months, i.e, just before treatment, 1st ,3rd, 6th and 12th month of the treatment. In the interviews, questions about food consumption changes and post treatment pain were asked to the participants and 24-hour retrospective food consumption records were obtained. Results: When the food consumption records of the adolescents before the orthodontic treatment and at the 1st ,3rd, 6th and 12th month of the active fixed Orthodontic treatment and aligner treatment were compared, the amount of fat (0.040), fibre (0.013), Vitamin E (0.019), Calcium (0.038) were significantly decreased in patients undergoing fixed Orthodontic treatment during the first month up to three months whereas no significant change was observed in patients undergoing clear aligner treatment. Conclusion: It is found that the nutritional intake remains unaltered in patients undergoing clear aligner treatment for the entire duration while there was a significant difference in the nutritional intake of patients undergoing fixed Orthodontic treatment for the first 3 months followed by a gradual phase of recovery up to the 12th month.