Tom Noonan started getting ready for the movie by reading about other serial killers. He did not like this idea when he started. He changed his mind and acted his own way instead. He said he wanted The Tooth Fairy to seem like "he was doing this out of love". Joan Allen played Dollarhyde's blind girlfriend. She went to the New York Institute for the Blind to learn about blind people. She walked with a mask on to learn about being blind.