Can you Permanently Stretch Your Hair?

I like to wear my hair in buns a lot (because I'm trying to grow my hair out) and although I take really good care of my hair (the curl pattern is consistent from root to tip) but I have this section of my hair that won't curl. I do straighten my hair (maybe 2-3 times a year) but it's not heat damage, I think I've permanently stretched my hair or at least "trained" the hair to be looser by always stretching it in that area? I was wondering if anyone else has that problem and knows what hairstyles I can do to re-train the curl. 

1 Answer

Possible over manipulation of the same hair style? Or just hair that's been weighed down with length or too much product? Have you tried to encourage definition with scrunching or the shingle method?