Will restoring a jailbroken iphone mess it up?

My iphone was already jailbroken when i got it-i upgraded it and it got stuck in dfu mode--i got it fixed--i have a 3gs by the way and the firmware is 4.1---im afraid i might mess it up again and i was wondering if restoring it through itunes will mess it up cus cydia is in it and i don't know how to take it out…

Restoring will put it back to the way it was before you jailbroke it. But you'll have to sync all your data back again.

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