When can I use hair straightener after my FUE surgery? Does the heat still damage the grafts after 7-10 days? (Photo)

I have added 1400 grafts ( 2000 hair ) on the front area I didn't shave my hair it was transplanted on my long hair I have just shaved the donor area I am thinking to start style how it was before till I get the complete results from the surgery in few month. Also I am not satisfied about the amount grafts I wanted thick hair on front but the doctor told me because I am from be Middle East he found it very hard to extract more than 1400 in a day because the grafts is curly and it will end up losing hair