I had this done last year and it lasted about 6 months my hair is very dry, frizzy and curly. It was well worth every penny I paid (it cos me £500 on a Caribbean Cruise). It does not damage your hair it makes it feel soft, silky, shiny and absolutely beautiful. You wake up in the morning and wash your hair and it blow dries exactly as you want it too. But make sure that it is Brazilian Blow Out and not the other copy cats that are out there. Check out http://www.brazilianblowout.com
it does exactly as it says on the tin, and there is definetely no damage to your hair.