Hair straightening without chemicals?

-Does anybody know what the natural hair straightening non chemical kit is called that you get done at a salon and how much it is? And if you have got it done how good it is. I have permed hair that is halfway grew outI'm not exactly sure but you might be talking about the brazilian hair straightening/ brazilian kertain treatment which is supposed to be good for your hair without damaging it but it's very expensive and if you do research on it, there are some people that say keratin isnt actually that good for your hair. other then that, there's only magic straight which is technically a type of perm but if you just take good care of it afterwards, it's not that damaging. there are also straightening creams you use once a month which do wonders at straightening your hair really well.Ironing hair or setting it straight will b the temporary option