Go for a good old champi using hydrating and moisturizing oils like argan, coconut, or jojoba oil and gently massaging it into the scalp.
Avoid Over-shampooing
Do not over-shampoo to remove the oil as it dries out the hair. Instead, use small quantities of shampoo and dilute it before using it only on the scalp.
Only condition the ends of the hair and not the scalp. In fact, condition the hair for around 30 minutes and then rinse it off in cool water. Avoid over-washing the hair post-conditioning.
Air Dry Your Hair
It's best to naturally dry the hair and use some anti-frizz serum. You can also use soft and micro-fibre or bamboo towels while drying your hair.
Supplements
Using supplements like RA skin hydrate and primrose can help give your hair achieve hydration from within.