Unroot 2.2

If you use Z4ROOT...

you will have the option to unroot once you are rooted

 

With z4root you can even "temp" root for that one session.

but once I did that a few times, I perm rooted and never looked back. All root does is make you administrator so you have total control over your phone. It does not do anything to hurt your phone.

Even with root, you ALSO need some sort of file manager like Root Explorer to go see all the files and folders in your system. (unless you are advanced enough to use terminal line commands). I'm just saying root is the first step. So, there's really no reason you would want to "un-root".

But yes you can, if you want.

 

I don't know why you would want to do that, but you could just delete /system/bin/su.