Most people's hair growth rate is about half an inch a month. I'm not sure now many inches your top is, but you can cut the relaxed hair one the sides once you get some new growth and just wear the sides curly and the top straight. The only thing you can do for the top is flat iron the new growth until you're ready to cut the relaxed hair off or just cut it all now and start fresh. If you go the flat iron route, you run the risk of permanently loosening or even permanently straightening the new growth.

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