I have 2a hair, and was doing the salon Brazilian Treatment for months. It was very expensive but gave great results. I had to stop because of the expense so when I found this product I was really excited.
I have color treated hair, and this product is absolutely the best. My hair is soft and straight. You must not wash your hair for 48 hours, and a straight iron with temp of 450 has to be used. I was scared to death to touch my hair with that heat (but knew that they did the high heat at the salon when I got the Brazilian). Not one problem, as indicated on the instructions your hair is protected.
You can curl your hair, straighten your hair, what ever you desire. But......YOU MUST USE THE SHAMPOO & CONDITIONER OTHERWISE THE TREATMENT WILL IMMEDIATELY DISAPATE. I have some of the old Keratin shampoo and conditioner from my days of the Brazilian which I am going to use. It actual is cheaper than the Keratin.
You will love what the keratin does to the hair. I am so excited to be able to go back having this treatment without the expense. (Brazilian Treatment at the salon in my area is $250 and last approx. 3 months.)