doesn't / won't fall off

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Here's a conversation between a make-up artist and a stunt man.

W: Please take a seat over here. So, this time you're doing a scene for Thomas, the movie's main actor.
M: Yeah. Today, I am supposed to jump from the roof of one building to another.
W: I'm sure you'll do fine. Now, lift your face up so I can glue your beard on.
M: I hope my beard doesn't/won't fall off when I'm jumping.

Would you tell me which one is correct? Do you use both of them? Is there any critical difference between them?
  • Sprache

    Senior Member
    I would definitely go with doesn't fall off. It sounds much more natural to my AE ears. I probably wouldn't say the other one, though it isn't wrong.
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