Board Thread:Versus Debates/@comment-28381997-20160509220110/@comment-3965545-20160510063148

The Tenseigan is permanent, once Toneri would of gotten back to full power and fully healed he would of had Tenseigan again... but unluckily for him Hinata took Hanabi's eyes back.. it's almost the same way when one doesn't have enough Chakra they can't keep their MS on and they can only use Sharingan, until eventually they have to turn even the Sharingan off.