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The understanding and classification of the condition known today as cleft lip/cleft palate has changed over many years.

Prior to the 1940s, the two main classifications were based on either the anatomical or the surgical perspectives.

From the surgical perspective, Davis and Ritchie classified this condition based on the location of the cleft relative to the alveolar process: prealveolar (lip), postalveolar (palate), and alveolar process cleft.

Brophy, a surgeon, proposed a list of 16 categories of cleft palate based on his understanding of anatomy. Veau simplified Brophy's classification into four different morphological forms.

In 1942, Fogh-Andersen classified cleft lip and cleft palate based on the incisive foramen, which is based on an embryological perspective: harelip, harelip with cleft palate, isolated cleft palate, and rare atypical cleft.