It sounds like a World Cup Soccer match result, but in fact, Brazilian Blowout is a hair-straightening product. And thanks to a wave of unpleasant responses to its use, the FDA has issued a warning letter to its manufacture.

Because it contains chemicals that become formaldehyde when heated – thanks, for example, to a hair dryer – and because formaldehyde can cause eye irritation, blurred vision, headaches, faining, chest pains and breathing difficulty, this is probably not a product with which you want to establish a close, personal, ongoing relationship.

According to AboutLawsuits.com, formaldehyde is classified as a probable carcinogen by the EPA and is considered a known carcinogen by the International Agency for Research on Cancer.