First of all, do not apply your conditioner onto your scalp as it can cause a build up on your head and make your hair limp and greasy. Also, do not apply your heat protector onto your root area as that will also cause greasy roots. If you’re using your straightening iron every day, then that will answer why you getting split ends. If the problem persists, then I would suggest you try a shampoo for an oily scalp such as L’Oreal Pure Resource Shampoo.