Are chemo curls permanent?

Hi, I’m 2 years and a few months post last chemo. My hair is now shoulder length and I’ve had about an inch cut off. It’s got lots of layers and has grown back very curly. If I brush it or go anywhere near a hairdryer it turns onto a big frizzy mess.  
Anyone know if eventually the curls will grow out ? If so how long? 

Hi if you put “ curls “ in the search bar of this section you will pull up several threads about this subject @Shi   can you help ?