Choose small pieces from our hair , and then use the Roller( do not forget the temperature no higher than 180Celsius,which will not hurt the hair).to roll the hair, keep 30ceconds,and the hair will be wavy, it is easy to work. about the straighten, use the Straightener(do not forget the temperature no higher than180Celsius) ,and then make the wavy hair be straighten, after that you could see the hair is natural and silkness like the hair before wavy.