Board Thread:Naruto Discussions/@comment-43776375-20190909151313/@comment-40242313-20190909163617

Well, I hope that cleared it for ya. The only known dojutsu from which you cannot revert back is the Rinnegan. But you can revert back to a Rinnegan from a Rinne Sharingan. That and the Byakugan, which is a completely different story.