Trying to perfect Frost's famous underbite cost the Welsh star jaw problems that he had to get fixed when filming on the Oscar-nominated movie wrapped.
He explains, "For two years, I had to spend most of the time with my jaw sticking out, and I started to have a problem. I had to have dental work.
"You know the thing that attaches your gum to your lip... I f**ked it up from doing that. I had to have work done on my jaw."
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