Board Thread:Naruto Discussions/@comment-4682609-20140806081616/@comment-24826628-20140806163023

I don't understand this debate about if its temporary or not. Tobirama said that when an uchiha is placed under stress the brain creates chakra in which the optic nerve reacts, displaying sharingan. Since he absorbed obito chakra this allow's him to achieve sharingan but there is only two things from here, either he will lose the sharingan or his own body will start producing the chakra needed to achieve sharingan. We will get the answer in the next chapter.