...  Feb. 2011. Stylists and clients often wear gas masks or other protective equipment and still may feel the ill effects of this potentially fatal gas. Many customers and stylists do not know that this Brazilian treatment often contains high concentrations of formaldehyde, a cancer-causing chemical. Relaxers are for permanent, but they are damaging to hair. Go to the FDA website & type in permanent or relaxers so you understand what are the side effects. Here’s the newest news: The Food and Drug Administration (FDA) recently seized tens of thousands of bottles of “Rio” hair relaxer products after determining they can cause severe hair loss or turn hair green. http://blog.taragana.com/business/2010/0… The FDA have warned consumers not to use “Rio Hair Naturalizer Systems,” a product imported from Brazil and sold through television infomercials by World Rio Corp. of Los Angeles. The official complaints against hair straightening products range from ...  It was a complete waste of money :/ However it was straight for awhile. But not very long. Source(s): I know hair. I have 4 decades of hair know-how. I have silky, shiny, soft, smooth very healthy hair down to my knees. Previously damaged by perming & dyeing in the 80’s & 90’s. I’ve known people in their 30’s whose hair stopped growing from ironing their hair in the 70’s. Know better? Leave your own answer in the comments!  Tags: los angeles, food and drug administration, hair loss ...