Nexus 5 Update: Will I Lose Root? I'm currently rooted but didn't do anything to my Nexus 5. It's just rooted but it's on its stock ROM. My question is, on the next Android update, will I lose root? Will the update just erase root permission and update? If not, how can I unroot?

I rooted my Nexus 5 in one click using RT Root tool or something, TR Root for Nexus. It's an app. It didn't work very well, some apps still didn't work. Is there an app that can completely delete ROOT before I update? Thanks.
If you update via Android's Over-The-Air (OTA) Update, you will lose root. You will need to re-root again if you want root access,