I have been using Zene Escova Progress for the last few years to straighten and smooth my hair. I get amazing results, shiny smooth easy to manage. I love it. It claims to be formaldehyde free and perfectly safe but having read other threads about formaldehyde free Brazilian Keratin treatments, I wonder if it really is safe or if I am risking my health. The list of ingredients is huge! Please could you clarify how it works, and if it is safe? Thanks