Orthodontics is an extraordinarily complex form of treatment that affects not only the teeth and their surrounding tissues, but also the extra oral tissues and systemic health of the patient.The orthodontic treatment is beneficial to the patient, only when the advantages it offers outweigh the potential damage. The common meaning of iatrogenic suggests the unpredictable treatment effects that comes "from the doctor". All such shortcomings could significantly impact the attainment, quality, and maintenance of the correction. Therefore the purpose of this book is to bring into the notice most commonly occuring potential damage caused through orthodontic treatment, their incidence and method to prevent such damage.