I have long debated and researched the Brazillian Blowout because I have wavy frizz-prone hair.
What it basically is is Keratin protein which seals your hair cuticles, thus reducing the frizz and nourishing your hair to make it super shiny and manageable. It also makes your hair straight, or considerably less wavy. This isn't done by the Keratin but instead by a very small portion (2% or less) of Formaldehyde. Yes, you read right, formaldehyde. Toxic? Well, yes BUT they don't apply it directly to your scalp and there are small quantities of formaldehyde in everyday cleaning products anyway. While the hairdressers will insist that their product is formaldehyde-free, it is not. It contains a derivative of formaldehyde but as it's 2% or less, they can declare it "Formaldehyde-free." Oh, for those who might not know, formaldehyde is what they use to preserve dead people in.
So this was my experience:
I went to the hairdresser, a little nervous about the effects some people have experienced when they heat the product as it emits fumes which are dangerous should there be insufficient ventilation. They were great though and answered all my questions and reassured me. The hairdressers, not the fumes.
First they washed my hair with shampoo that felt like it stripped my hair terribly. I had to sit with that on for 20 minutes. The shampoo removes all the build-up and natural oils from your hair so that the product can penetrate the hair shaft.
Next they applied the product which smelt a little like oranges. They then gave me a dust mask, as I'm asthmatic, and told me to close my eyes while they dried my hair almost completely with a hairdryer.
Once my hair was almost dry, they flat-ironed each section 10 times. There were two working on my head at once so it took about an hour in total to do the whole treatment.
Once they had flat-ironed my hair, it was back to the basin where they washed and conditioned my hair with Sulphate-free shampoo and conditioner. They dried it brushing it occasionally with a normal hairbrush and my hair was dead straight and super shiny and my hair colour was more vibrant!
I then went and bought some sulphate-free shampoo from Dischem, as the hairdresser's is significantly more expensive and does the same thing, and some nice conditioner. The sulphates are just a cheap foaming agent but they strip colour from your hair and dry it out quite badly and can even contribute to hairloss.
I have since tried just leaving my hair to dry with no heat to tame it and it dries with the slightest wave and hardly any frizz. I love it!
Most of these treatments require 4 days of no washing your hair or tying it up or wetting it but not this one, I was able to go home and wash my hair immediately if I so desired. It did start pouring with rain as they were blow-waving my hair at the end so I left with a packet tied around my head much to the amusement of the patrons in the beauty section having their nails done. I suppose saying "Thanks so much! I really love it!" to the hairdresser while you stand there with a packet on your head is rather amusing.
It is a pretty pricey treatment but it lasts for 3-6 months. I admittedly didn't pay full price for mine and there are always specials on these treatments so if you have it done, shop around first.
I would recommend this to anyone who battles with their hair but do your research and know what your lungs or eyes can and can't handle as far as toxic fumes go. Some people get sick but honestly, I felt fine.