As some of the other posters stated if it aint broke don't fix it. Back when I was permed and transitioning I used indian hemp grease to flat iron and the new growth would revert no problem. I would use grease now to flat iron but more natural oils like Oyin burnt sugar I do have Fantasia IC heat protectant just to see how it works. I do believe her hair is so healthy because she does deep condition before her presses so that maybe has something to do with the fact that her hair is so healthy despite the use of grease
				
			
					
				
	
). Her looks nice and if it works her, do your thing girl :notworthy.
 I have a cousin with between BSL and MBL hair who flat irons her hair with grease as well. 
 back when i was in middle school my mom used to press my hair with isoplus pressing somethin and that was good OR either that good ol blue magic