Just heard that Kenneths is promoting a Hair Smoothing Treatment. This treatment contains FORMALDEHYDE - some studies of humans have suggested that formaldehyde exposure is associated with certain types of cancer. The International Agency for Research on Cancer (IARC) classifies formaldehyde as a human carcinogen. There have been health alerts about this ingredient. Example: Yesterday, the US Department of Labor's Occupational Safety and Health Administartion (OSHA) issued a hazard warning to workers and owners of hair salons to alert... read full review »