Just did my 5th keratin treatment by Sophie who I highly recommend in addition to the treatment itself! I have fine hair - but a lot of it - and it easily becomes frizzy and fluffy in our humidity. Unlike previous keratin treatments I've had that leave my hair stick straight and unable to be washed for 3 days, this treatment still leaves me with body, smoothness, and it looks healthier - plus I can wash it the next day! In addition, I have never had any damage to my hair from it. Yes, it's pricey, but I spend far less time on my hair which means much less heat and damage to it and I can go about 5-6 months before my next treatment.