I had the Coppola keratin treatment about a week ago and I am totally in love with it. My question is, I DO understand that we need to use non-SLS shampoos. My hairdresser said I HAD to give up my old poo & cond, and I get the shampoo part, but I don't understand why I can't use my old conditioner, as I later learned, via the Internet, that conditioners are SLS-free anyway.

I was encouraged to buy the mega-expensive salon products, which I did, except I just don't like them, I've realized. I can cope with the shampoo. But why can't I use my old conditioner?

Anyone know?