Hinata was then able to activate the chakra to try and destroy the tenseigan. It strengthens her lion fist, and generally seems to be more potent than her original chakra. It is the only thing that can destroy the tenseigan apparently, but Hinata herself being somewhat weak makes it ineffective until she combines it with Naruto's attack. As for the permanence, we are not shown evidence one way or another, as she never gets another chance to use it. Toneri literally puts her in a cage (again, parallels to the caged bird seal of the Hyuuga) and she is out of the fight until Naruto plants Toneri's body into a cliff with a punch. At this point SHE is the one to end their battle by ripping Hanabi's eyes out of Toneri's head.gg