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Introduction: Orthodontic therapy causes improvement of periodontal health status on patient having malocclusion. During treatment it may cause periodontitis since the appliances provide platform for adherence of food debris. So it is essential to evaluate the periodontal status of orthodontic patients through CPI score and loss of attachment LOA.
Objective: The objectives of the study is to evaluate the periodontal status in patients undergoing the orthodontic therapy by using Community Periodontal Index (CPI) score and Loss of Attachment (LOA).
Materials and Method: Hundred orthodontic patients as case group from department of orthodontics and 100 patients as control group from other departments except Orthodontics and Periodontics with age ranging from 15-30 years of both genders were enrolled for the study. CPI score and LOA were taken with the help of CPITN-C probe. Data were analysed using SPSS software version 20. Chi- square and Student’s t-test was used for statistical analysis.
Result: Eleven out of 100 orthodontic patients (11%) had developed pockets (score 3, 4) whereas only one out of 100 non-orthodontic patients (1%) showed pocket formation. On comparing the periodontal problems in orthodontic and non-orthodontic patients, statistical analysis showed significant difference (P=0.002). Evaluation of loss of attachment in orthodontic and non-orthodontic patients showed significant difference (P=0.001). 
Conclusion: The present study found CPI and LOA scores were increased in orthodontic patients. Interdental brush user and non-user had equal impact on periodontal health status.

Community periodontal index; loss of attachment; orthodontic therapy; periodontal health.