Draco Malfoy
In the books, Hermione is described as having "bushy brown hair" and brown eyes. Her front buck teeth, already very large, grow uncontrollably in "Goblet of Fire" after she is affected by a spell cast by Draco Malfoy. Madam Pomfrey attends to her in the hospital wing and, at her request, shrinks the teeth down to a normal size that matches her mouth. In the films, her hair is less bushy and she always has regular teeth.