Intrusion is a common orthodontic tooth movement which is employed in the cases of deep bite where anteriors are intruded for correction, or in anterior open bite where posteriors are intruded to close the bite for correction. The article includes the biomechanics of Intrusion in Orthodontic treatment and various methods to achieve the Intrusion tooth movement successfully without causing any deleterious effect to the tooth. It also containthe types of Intrusion, their indications and contraindications. Use of various fixed appliances and their modifications to achieve intrusion mechanics is discussed and reviewed in the article.