theres a rumour that Sodium Laureth Sulphate(SLS) causes cancer.... it is found in shampoos, soap, toothpaste etc.... actually almost all of these products found in the market contain SLS. i dont know much more about it, but i remember reading a stuidy that mentioned that even though the short term risks may not be that strong, it is potentially fatal during long term use. dont know how much of this is true, but what i DO know is that SLS is an extremely strong garage cleaner... even though it might not cause cancer, it will cause dryness and flakyness of the skin.... scary!!(dandruff scares me)