Do you want this effect to be permanent or have the option to have curly hair again after a while?

I want it to be as long as it can last. I just want wavy hair that i can manage. I prefer to find something that is a brazilian or keratin treatment brand. I really want to loosen them alot from 3b to 2a/2b. I dont really care if it lasted up to 3-4 moths and I redo it or it being permanent. Thanks for your response back.