Authors' response

We thank Dr Waxler for his comments and question on our article.1 In the published article, we referred only to the extraction of 4 first premolars—not 4 premolars broadly. That means that the 10% rate reflects only the extraction of 4 first premolars and does not include the extraction of second premolars, combinations of extraction of first and second premolars in opposing arches, unilateral premolar extractions, single incisor extractions, and so on. The inclusion of 4 first premolar extraction rates was for historical comparison only, to mirror the Proffit work from 1994.

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