zwieback (rusk)
??
A well known old zwieback/rusk brand in my country has a picture of a baby boy on it´s packages. This baby boy has the same big (kind of cartoon rabbit like - incisors) teeth, that Daniel Radcliffe has.
(More obvious, when D.R. was still a young child, not so much any more, today.)
Whenever somebody has these two big incisors (especially children), (s)he reminds me of zwieback/rusk. D.R. did this - especially in the first three Harry Potter movies, too.
I don´t mean this in a negative way or even as an insult. I´m a big fan of Harry Potter books and movies and I think, Daniel Radcliffe did a very good job. And he did the same as a grown up in "Woman in Black".