Purpose. As documented in the literature, bony defects can be managed by an orthodontic approach. Methods. This case report describes the treatment of a bony defect caused by orthodontic malposition through phase I periodontal therapy and a simple removable orthodontic appliance used for the first time in a 20-year-old girl. Results. The periodontal pocket was reduced from 8mm to 3mm shortly after treatment. Conclusion. This case report concludes that orthodontic therapy can be used successfully in treatment of bony defects caused by mesially tilted molars.