In Mimi Gets a Tooth Filling, Mama, Mimi, and Baby-Sis go to the annual county fair. Mimi can't wait to play games, eat delicious food, and ride the Ferris wheel and teacups. At the end of the day's adventure, Mimi enjoys a tasty treat from the food stand vendors. But when she bites into a candy apple, she feels a sharp pain inside her tooth.

Mama takes Mimi on a trip to see Dr. Jason, the town's pediatric dentist. What will Dr. Jason find when he checks Mimi's teeth? Will he find the cause of her pain and help her find relief?