Your best bet is to go by how your hair feels. My hair has never gotten over-proteined (and believe me, I tried), so i use protein every day, but I know not everyone can do that. If your hair is dry, make sure that you're using moisturizing products (protein an moisture are not mutually exclusive).

3a/f/iii
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