Oh I feel you.
For me the effects of the BKT were permanent. Some parts were completely straightened (I think those parts were a combo of major heat damage and BKT), other parts just permanently elongated.
I have noticed that the curls around my face seem looser than I remember BUT I have been frying/perming my hair for eons so I don't know, I may just have looser curls around my face. Thats why I'm ceasing all flat ironing so I can see the real deal as it grows.
Current State: Growing out keratin treatment.
High Density, Medium Porosity
Length: MBL stretched
Doing what I want when I want! Getting tempted to bkt the nape save me lol