Farhan Ahmed was the pick of the Nottinghamshire bowlers as Kent were made to follow-on during day two of their County Championship Division One encounter.
The 16-year-old finished with figures of 4/37, with Rob Lord and Luke Flecther chipping in with two wickets apiece, as the home side were bowled out for 225 after the Green and Golds had earlier made 433 in their first innings.
Kent finished the day on 85/0 having been asked to bat again by Nottinghamshire captain Haseeb Hameed, still 123 runs behind.