Need your help! I see that Christo Salon and Ouidad in NYC all have bio softener treatments to reduce curl. HAS ANYONE done this? What was your experience like. How does a softener work vs. Keratin?

I'd really like to try something soon. But I'm so afraid. Afraid that with Keratin I'll lose all curls. And, with softener it will break?

I have 3b/c hair (I think) and it's really think and if shorter gets a bit out of control in the summer.

Thank you!
rsw