Christopher Dean and Tim Cole at University College London, who studied the microscopic structure of adult molars to rebuild the pace of their development, found that the roots of chimpanzee molars go through a growth spurt as the teeth erupt through the gum, most likely to provide more stability for biting and chewing.
It will help them have their independence while knowing that you have their back.
It is responsible for much of the difference in adult size between men and women.