Any heat applied to hair can cause damage, to offset that use the appropriate conditioner and from time to time use a hot oil (any beauty shop will know what it is) to replenish that removed by heating.
Curling Irons burn your hair. Anything for your hair that is hot and you use it, you are at risk for burning your hair. Also, don't dye your hair continuously dying your hair because it also damages...
This will not work with curling iron, you can braid you're hair ( if it is long enough) , after taking a shower, then leave it in for a couple days then it will be wavy.
With heat of course. Curling irons and straighting irons basically burn your hair in that position. It does do what you ask it, but it damages your hair.