I think that Kylie, Kim, and Khloe wear extensions/wigs/fake hair most of the time, to be honest. And I love how she made a big deal about growing her hair out so it's healthy. None of their hair is healthy, to be honest. The Kardashians/Jenners are "done up" all the time. Their hair is probably fried from straightening irons, curling irons, etc. and therefore probably needs to be cut, which is why they all probably wear extensions....I would probably not call her hair "healthy", this girl does a lot of photo shoots and no doubt her hair is probably heat styled for every single one.