Hair smoothing products, also referred to as hair straightening products, may release formaldehyde gas, a known human carcinogen, when heated. Only licensed and trained salon professionals should use these products on your hair. Here are some steps to take if you are considering using them.
Read more at: http://www.fda.gov/consumers/consumer-updates/formaldehyde-hair-smoothing-products-what-you-should-know
