My mom went through the three cycles that you're supposed to use. She has I guess you'd say light-medium coarse hair. She ran to her stylist in about 18 weeks, to get her kitchen together with a 'chemical relaxer'. While she enjoyed the body (your hair will not be stuck to your head) that the 'Copa' system allowed, her roots were still 'laughing' at her in about a week after each application. I think it truly depends on what level of 'straightness' you desire from root to tip!
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