cut one's teeth on

cut (one's) teeth on (something)

To gain experience with something, especially at a young age (when one's teeth would be coming in). Oh, I cut my teeth on those kinds of equations! Give me a challenging problem for a change! Jen may be young, but she cut her teeth on academic writing, so her perspective and expertise will be invaluable to us.
See also: cut, on, teeth

cut one's teeth on

Also, cut one's eyeteeth on. Get one's first experience by doing, or learn early in life, as in I cut my teeth on this kind of layout or He cut his eyeteeth on magazine editing. This term alludes to the literal verb to cut teeth, meaning "to have teeth first emerge through a baby's gums," a usage dating from the late 1600s.
See also: cut, on, teeth