(Chapter 11) Footnote 18:

Historia Animalium 501b20: “Males have more numerous teeth than females not only in humans but also in sheep, goats, and pigs. Examination has not yet been fully made of other animals. In general, the more teeth animals have, the longer they tend to live; those with fewer and more widely spaced teeth are on the whole shorter-lived.” (Loeb trans. by A.L. Peck). Pliny N.H. 7.71 and 11.167 follows Aristotle regarding male vs. female dentition, but takes issue with his statement regarding longevity (N.H. 11.273-4). Galen follows Aristotle in attributing more teeth to males.