While most people complain of brittle straw-like hair if they use too much protein, there are a number of people who get softer and straighter hair instead. It could be that your hair dislikes the specific protein you used, or it could be a protein sensitivity. You would have to experiment more to know for sure. The guidelines of fine hair likes protein and coarse hair doesn't aren't hard and fast rules and there are women here with fine color-treated hair who cannot do PTs. In the end, no two heads of hair are exactly the same.

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3a/f/iii
Modified CG since 11/5/11
CLEANSE: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo, CHS Treatment Shampoo
RO: DevaCare One Condition, SS Caitlin's Conditioner, Mop Top Daily Conditioner
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier and Strong Hold Mousse, Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel