Abstract
Extra oral appliances have been used since ages to bring about dental changes, skeletal changes and for anchorage reinforcement. Growth modifications can be done with help of these appliances. This can be done by inhibiting the growth or redirection of the growth. The biomechanics of the extraoral appliances needs to be understood well for using these appliances. The topic of headgear is vast and the following article tries to cover the details regarding the same in brief. The location of centre of resistance for application of force is important and plays a significant role in biomechanics and outcome of treatment results. Various types of headgears and their use depending on different criterias are discussed in detail.
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