Thirty specimens of Glis glis orientalis born in captivity were used in this study. In captivity, animals were fed on hazelnuts, chestnut, apple, biscuit, acorn and sunflower seeds under uncontrolled conditions. Cranial and dentition features were examined from 45 days to 1824 days. At the age of 45 days, teeth were not worn, the cusp pattern of P(4) was not recognisable, and the cusps of M(3) and M(3) had not erupted from dentary. In 126 days old, cusp line of M(3) and M(3) reached M(2) and M(2), and the cusp of P(4) had developed. In 186 days old, tooth had started to wear.