Can I un-jailbreak my iPhone if I want to?

I have the iPhone 4, and I was wondering if I can unjailbreak it, and still have everything I had before I jailbroke. (Music, apps, contacts etc.) And how do I do this safely? I have ios 5.1.1

If you restore your iphone, it will go back to the exact state that it was the last time you synced it before the jailbreak. So if you synced it, then jailbroke it, and then restore it, it will go back to the way it was before the jailbreak. You lose all jailbroken apps, and things you got from jailbroken apps.

Just back up using iTunes
Restore using iTunes then
Restore to the backed up point using iTunes.

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