One of the biggest fears that many users have before rooting their device is something going wrong with no way to return to stock. Fortunately, we have a brilliant root community behind us, and thanks to Team ACS, we now have an unrooted, stock kernel available to flash via ODIN. This way, if you encounter any issue during or after rooting your device you have a way to restore the kernel back to its factory state.
The process is very simple, and if you have any previous experience using Samsung's ODIN utility, you should be right at home.
[Thanks, Captain Anonymous!]