Jonah Hill struggled to speak while wearing prosthetic teeth in new movie
© WENN 2013
The 21 Jump Street star had to practise talking for a month before shooting the film to make sure he could be understood when filming began.
He tells breakfast show Good Morning America, "It was interesting because I had to learn how to re-talk again because I had such a horrible lisp when I put them on... I would rehearse with them in and I would just also make phone calls all the time with the teeth in, so I could lose my lisp and also do the strange accent... So I would just stay on the phone for as much as I could..."
In the film, Hill plays Donnie Azoff, a character based on Daniel Porush, who was convicted of securities fraud and money laundering.
The Wolf Of Wall Street stars Leonardo DiCaprio as real-life stockbroker Jordan Belfort, who served 22 months in prison for stock market manipulation.
The movie hits theatres in the US. on Christmas Day (25Dec13).
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