Review on Brazilian Keratin Smoothing Treatment - KERAGEN Blowout Straightening System For Dry And Damaged Hair, Formaldehyde-Free, 16 Oz - Eliminates Frizz And Curls, Ideal For Fine To Medium Hair by Matthew Shankar

I've used this product twice now on my 4c hair and it works great! Easy to use, and keeps my hair straight for weeks (I sweat from my head a lot, and my 4c hair usually reverts in hours w/out treatment). I don't even traditionally wrap it at night, I put on my scarf and bonnet, that's it! And, my hair reverted fully on the first wash with NO DAMAGE to my kinky hair. While this product works great, BEWARE: On sensitive skin, you will need ear protection because the treatment is very irritating on the skin. Also, make sure that you DON'T apply on the scalp, for you will have extreme irritation. Overall, I like this product, would recommend and repurchase.