I have curly hair, will a relaxer make it straight !?

soo i heard that its really bad for you but my hair is soo curly and i straighten it like every day ive stoped doing that now for about a month and am waithing for it to grow long so that i can relax it ! what will it do will my hair be wavy or will it be pletly straight ? witch one should i use ive heard about the brezilian relaxer and apparently its better than the others is that tru ? and if and when after i do it is it safe to colour it afer relaxing it ?? thanx