I am a licensed cosmetologist and I have naturally curly hair and this is how I straighten hair. Wash hair then towel dry ( it's important to remove all the moisture from the hair before conditioning so your hair absorbs the conditioner) then condition.( you can allow conditioner to sit for up tp 5 min depending on the hair texture ) then rinse with cool water( this allows the cuticle to close in all the conditioner you put in). Apply product such as CHI Straight Guard NEVER APPLY HEAT TO HAIR WITH NO PRODUCT ON HAIR FIRST blow dry hair until 80% dry. Then section hair into 4 sections 2 in front and 2 in back drop 1/4 slice of hair use round ceramic brush such as CHI Round brush dry completely. NEVER USE A IRON A WET OR DAMP HAIR. Then spray with Flat iron Spray Such as SOYA Want FLAT Hair by Healthy Sexy Hair. Then Straighten with a flat iron such as Farouk CHI or Sedu iron.( the 2 best on the market) Continue with sections until head is done. Style and finish with Farouk Biosilk.

Depending on how much oil your glands produce you can keep this style with no washing for upto a week. Just touch up with flat iron and style.