Co-operation, coordination, and interaction between different specialties in dentistry are extremely important in establishing diagnosis and treatment planning. Interaction between the different disciplines is necessary and in some cases it is crucial in facilitating coordinated dental therapy. The interrelationship between Orthodontics and Periodontics often resembles symbiosis. In many cases, periodontal health is improved by orthodontic tooth movement, whereas orthodontic tooth movement is often facilitated by periodontal therapy. Prior to 1970's orthodontic treatment often less recommended to "prevent periodontal diseases". Crowded teeth which are difficult to clean, can result in plaque accumulation and gingivitis which may lead to periodontal diseases. Orthodontic treatment can promote periodontal health and may prevent periodontal diseases.New treatment philosophies with improved clinical techniques and changes in patient's awareness of malocclusion have resulted in increased demand for orthodontic treatment. A successful outcome of orthodontic treatment is largely influenced by the patient's periodontal status before, during and after active treatment.