My Recommendation, if the area is thinning is to ask the stylist to avoid relaxing that section and to pick up some Nexus VitaTress Biotin Creme and or Surge.
A friend of mine has 3 spots on his head which recently went completely bald (two about the size of nickels and one about the diameter of a quarter). I bought the creme for him, he's been applying the Biotin Creme to his scalp for about 4 weeks now and the first two spots to bald have begun to regrow. I say begun because he now shaves his head to hide it (but you can still tell because the patches are still a little smooth). But, when he's gone a few days between shavings, you can see the stubble in these areas filling in, some of the hairs are finer in texture (skinnier strands) but it is growing in when we thought originally there was no hope. I think as the follicles totally recover, the hair strands will thicken.
The third area hasn't changed yet but he's consistent with it, twice a day. Maybe I'll take a photo this weekend and update when this one fills in too.
I only regret not taking photos because I wouldn't have believed it had I not have seen it for myself.
HTH