Robbie Fenwick

Robby Fenwick was a Muggle boy whose whose dentists were Mr. and Mrs. Granger. During one appointment, he bit Mr. Granger, giving him a wound that required ten stitches to close. Hermione Granger related this story to Horace Slughorn, a wizard unfamiliar with the Muggle world, when he asked if dentistry was a dangerous profession.

Appearances

 * Harry Potter and the Half-Blood Prince