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In their classic article on the subject Peck and Peck [1] reported extraction frequencies taken from 12 studies over a 66 year period, that varied between 6.5 % to 83.5 %. They also recognised that the decision to extract teeth as part of orthodontic treatment was both contentious and emotive. To quote "For years the question of extracting permanent teeth as part of corrective orthodontics has provoked professional controversy and debate, often of religious intensity".

How Many Teeth are Extracted as Part of Orthodontic Treatment? A Survey of 2038 UK Residents