A preschool teacher told the story of Sophia, a toddler who was in the habit of biting other kids. Although the teachers tried to intervene and show Sophia how sad the other children felt when she bit them, Sophia continued to bite.
They finally solved the problem by attaching a teething ring to Sophia's shirt. Whenever they saw she was looking like she might bite, they gave her the teething ring to bite instead. This actually solved the problem of Sophia biting other kids as she learned to bite the teething ring instead!