How to unroot from SuperSU (HDX 7")

Hello everyone, I've been very tempted to root my kindle fire hdx 7 and I've finally decided to do it, but there is still one thing stopping me. Let's say I want to go back, no root and update to the latest version of Fire OS. How do I do this? If I do root, I will be running 4.5.2 with SuperSU from this thread: http://forum.xda-developers.com/show...1&postcount=56
Thanks! :)