There are people who will still straighten their hair on occasion. The biggest potential problem is heat damage (same reason diffuser is recommended instead of regular blowdrying). But I was given a piece of advice when I went for my Devacut in April. The stylist told me to think of my curls like a muscle- the more often they are worked, the stronger they can become. I've found that to be very true. If you straighten your hair a couple times a year, no one will take away your CG card, but if you straighten regularly, you probably won't see the full potential of your curls.

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Modified CG since 11/5/11
CLEANSE: CJ Daily Fix, DevaCare No-Poo, CHS Treatment Shampoo
RO: SS Caitlin's Conditioner, CJ Beauticurls Strengthening
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier,Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel