I got 'Cezanne Perfect Finish Keratin Smoothing Treatment' at the salon twice in the last year. After the first time, my hair was fabulous, smooth, and shiny, and the results lasted more than 2.5 months. I was very happy with the treatment, and was so excited to find a sorta safe alternative to hassle free hair care.
However, the second time I got this done around the 3 month mark, the results lasted until the next wash, which was totally unexpected. I really wanted this to work, but it was so disappointing. I cared for my hair the same exact way as I did before, with no change in shampoo/conditioner.
Not sure how these products or application procedure changed in the 3 months (besides the increase in price of course). The results and the value of the treatment vanished to 0 for me sadly!