On the curly girl handbook dvd this girl went from 4a to 3ab, I think she just moisturized stopped using sulfates and silicones, but if you do something to permanently alter your hair I'm pretty sure you'll have damage, my heat damage made me a 2c/b but now im a 3b/c with 2c at the back (genetics). But some claim keratin treatments help take the curl out, this 3b/c girl became a 3a in her second treatment (to bad she wasn't looking to be) but she's slowly recovering.

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CG/LOC Method's 3b/3c hair SL-Curly/ Goal-MBL Curly
Weekly Poo/Low Poo: some Shea M Poo.
Weekly Deep Treat-Dermorganic Intensive Hair Masque
Bi-Weekly RO:Tresseme Naturals - V.Smooth/N.Moisture
Daily Leave in:Shea Moisture Extra Moisture Detangler
Daily Oil: Olive Oil & Conut Oil Mix
Daily Styler: Shea Moisture Curl & Style Milk