Heck noooo. Heat what? Besides a hood dryer, that's the only heat my hair sees besides body heat /images/graemlins/smile.gif
After I wash my hair, and I roller set it, I use the Arosci Leave-In Treatment, as it leaves my hair really soft and you can use as much as you like.
If I notice that my hair line isn't as soft as I like it because of whatever reason during the week or I feel as if my hair is lacking moisture, when I wrap my hair at night, after wrapping it, I'll spray some Hair Dew onto my hair liberally, apply a little hair oil to seal the moisture in and tie my scarf down. By morning, my hair is even straighter and softer.