How do Beauty Salons do permanent straightenings?

Just curious.. How do they do that?How do Beauty Salons do permanent straightenings?
they use a perm solution and instead of curling it they brush it out.How do Beauty Salons do permanent straightenings?
They actually use a type of gel and mineral spray that locks each straightened lock of hair down. Hope this helps :D
they go to curl your hair, with all of the toxic chemicals and all that, but they dont put the rollers in. You still have to put your head in a sink for over 2 hours, but your hair comes out straight instead of curly.
chemicals...alot alot of chemicals go into your hair and make it that way. %26amp; you need to use a special shampoo and conditioner and everything. around where i live, it costs around $300 to do your hair ; depending on the amount.