A manikin assists a student in learning to perform root canal therapy on a primary tooth of a child without damaging the underlying adult tooth bud. The manikin includes one or more inserts including a model of an upper primary tooth with roots and a lower adult tooth bud. The manikin includes a jaw portion that is receivable into a hinged dental training aid, so as to simulate the mandible or maxilla of the child. The jaw includes bony portions with a plurality of insert-receiving sockets. The bony portions are covered by an elastic simulated gum tissue that engages the primary tooth of an installed insert.
