AIMS: To assess and compare the changes in body weight, dietary habits, and pain perception of patient's undergoing orthodontic treatment at the initial stage.MATERIAL & METHODS: This was an observational prospective cohort study to assess patient's changes in body weight, dietary habits, and pain perception undergoing orthodontic treatment at the initial stage. Thirty patients who received orthodontic treatment "for the first time" and those who will get comprehensive orthodontic treatment

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... within the age group of 18-30 years old including both genders were included in the study. The weight as well as dietary habits of patients were measured at the initial visit, "prior reserving of any the orthodontic treatment" as (T0). Re-evaluation of patient's weight, dietary habits, and pain perception were re-assessed on the next visit" after fixed orthodontic appliance bonding" as (T1) one month later. The pain, discomfort, and dietary habits changes were evaluated using a validated questionnaire.RESULTS: The mean (SD) patient weight at first and second visit of orthodontic treatment was 67.43 (24.42) and 64.98 (22.7) kg respectively. The difference in the patient weight between first and second visit was statistically significant. Patients with discomfort and patients who used medication to relieve pain were reported to have more weight loss.CONCLUSIONS: This study confirms the initial loss of weight, pain and discomfort among patients who undergo orthodontic treatments. The findings of this study are of importance among the orthodontic centres and practitioners highlighting the importance of their guidance in structured diet planning and advice after treatment.