Will a Keratin Treatment Kill my curls or damage my hair?

I was considering a Keratin Treatment so my hair can be more manageable and less frizzy. Does a Keratin do more damage than harm? I'm not really looking to loosen my curls but I do want more manageable hair. Will this kill my curls (3b/3c) ? My hair is slightly damaged but has come a long way since my last perm years ago. 

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