I was reading Allure mag. and they had a 4page spread about this treatment. It talked about how it causes nose and brain cancer. It said that it has a high dosage of formaldehyde in it that is toxic . One lady in Brazil was found dead in her shower because of the fumes this treatment gives off when in contact with heat. I just wanted to share this info because there is alot of ladies here (myself included,not anymore)that was intrested in this treatment. Just make sure to do your research . Allure mag. Oct./07 issue. Investigation Article "Scared Straight"