To have a healthy scalp is very important to have a shiny straight hair! Use a little amount of head and shoulder for dandruff shampoo everytime you take shower before using your favorite shampoo(not for dandruff).Then of course dont forget your favorite conditioner.Use coconut oil to condition your hair even just once a week. (For really wavy hair, use ceramic iron to iron your hair before you condition your hair with the coconut oil.)Brush your hair hundred times during daytime and before going to bed. Avoid using anything that can break your hair such rubber band.If you can prevent making any style which can wrinkle your hair such pony tail,curling hair of course...and etc.it will be really big help!