Review (5/5): I highly recommend this product if you have curly, dry, brittle, dull and frizzy hair
I didn't buy this treatment from Amazon, but I thought I'd review it since when I browsed it before buying the product I wished it had a good review.
This keratin treatment did truly what it said it would, my frizz has been 99% tamed and my hair looks and feels soft. It's silky, smooth and shiny. The down side was that my hair was weighed down after washing the treatment. I hope this will go away in the next wash cycle or so. I followed the instructions provided, if your hair is resistant or virgin to keratin I recommend shampooing with the Anti-residue Shampoo (Step 1) twice making it work in your hair for 5 minutes each time. You can then let your hair air dry or blow dry it with either cool/warm/heat setting up to 85-90% (I used a cool setting here). Then apply the treatment (Step 2) with a fine comb after sectioning your hair, make sure not to get it too close to the scalp unless you're combing it upwards fast. The key thing here is to not let the solution drip down to your scalp or skin otherwise it will burn and cause irritation. A bit of an advice here, if you have vaseline I'd recommend applying it to the skin area that's close to hair line avoiding touching any of your hair (of course this is optional). Try not to over saturate, once all your hair has been coated well with the treatment without over saturating use the cool/warm but NOT the heat setting in your blow dryer to fully dry the product before using the flat iron. You can use your fingers to help with the drying and not a brush/comb. The ironing step is crucial here, you want to make sure that every strand is straight and coated with the heat from the iron 8-10 times. This ensures a straight hair after washing the treatment, so move the flat iron on each section 8-10 times on a perpendicular angle from the scalp. Once it's all straight, you can go ahead and wash your hair with warm water ensuring to scrub your scalp with your fingertips to get rid of all the solution out of your hair, then towel dry (no water dripping) before applying the "Repair Mask" (Step 3). With the last step, apply the mask generously all over then massaging it to your scalp and ensure the ends are covered too. You can wrap a plastic/shower bag and warm dry towel (I warmed my towel in the dryer first) and leave it on for at least 30 minutes or longer (I left mine close to an hour). You can comb the mask to make sure every strand is well covered.
In case you were wondering, you don't have to keep your hair straight when you apply Step 2 (Keratin Treatment), in fact once you've done a section you can swirl it back and clip it. For me, when I coated all my hair I took the clips out and combed my hair again before blow drying. Then after washing the mask thoroughly I left my hair to air dry, but you can use a heat setting here if you want to.