(Chapter 11) Footnote 10:

For the doctrine that teeth grow continually throughout life, cf. Berengario da Carpi, Isagogae breves (1522-35): “[The teeth] increase for the sake of their purpose throughout the whole time of their permanence, since if they did not increase they would not endure, and mastication would be bad; hence life would be short” (tr. Lind 1959, p. 118). Vesalius’ description appears consistent with the then-current concept of the “passive eruption” of the teeth.