[Doctor Francisco Pérez Cascales. Biography and odontologycal chapter of his work].

Given the absence of odontological texts and against the background of the very poor development of this branch of surgery during the XVII century, we have thoroughly investigated the medical, surgical and paediatric texts of the century, all scattered around and of different length, and have bumped against the text of the noteworthy "paediatrician" of the Rénaissance, Francisco Pérez Cascales who, in his "Liber de affectionibus puerorum", tackles, in hand with the Greek and Roman classical authors, only one oral and dental problem: mouth ulcers, and lingers on their aethiology, diagnosis and clinical treatment. We are also remaking the biography of the author, trying to fill in the many blanks found in it and correct the multiple errors through the incorporation of appropriate documents and references.