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I haven't purchased this from this website yet, but there is a reason for that... It lasts forever. Period. I bought my last tube at the beauty salon about 5 mos. ago and I still have quite a bit to go. People can complain of the price, but Kerastase almost pays for itself, especially Ciment Thermique. It takes only a hazelnut-size amount per use and it goes on wet towel-dried hair before you blow dry it. It works as ahead protectant and it helps to fill in missing hair structure to fortify weak hair that's been damaged by color, chemical, flat iron, and blow drying practices. My hair is smooth and not weighted down (fine hair but a lot of it). This stuff will save your locks when you think they are too far gone. I will be buying my next one from here!5