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http://www.wikihow.com/Take-Care-of-Relaxed-African-HairTake-Care-of-Relaxed-African-Hair

Ten things I can agree with 
1.Relax your hair every 8 to 12 weeks depending on your hair's needs. Do not relax your hair every time new growth appears, since relaxing too often causes damage to the hair. For one week following your relaxer, use a reconstructor instead of your regular conditioner when you wash your hair. Aphogee makes an excellent reconstructor and shampoo. After a week return to your regular Moisturizing shampoo and conditioner. Keracare or Elucence are good ones.

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Wash and condition your hair every 4 to 7 days. Try to use mild and gentle shampoo and conditioner designed for chemically-treated hair. If you have sensitive skin, consider using shampoos that do not contain Ammonium Lauryl Sulfate or Sodium Lauryl Sulfate. Paul Mitchell is an excellent line for damaged/chemically-treated hair. Using a deep conditioner that contains both protein and moisture once per week is ideal, try Organic Root Stimulator Replenishing Pak or Paul Mitchell Hair Repair. Chemically-treated hair must always be treated with a leave-in conditioner after every wash. Motions Nourish is a great example of this. Comb the wet hair with a wide tooth comb or shower/detangling comb as the wet hair is in its most vulnerable state and is more likely to break.....check link for more