The telegraph are brazilian blow dries bad for you?

Zoltan Vargyai, hair stylist and hair texture expert

I don’t think formal – it’s called formal when it’s in liquid form and formaldehyde when it’s in the air –  is bad for the hair. I know people are concerned about breathing it in, but it does depend on the skill of the stylist and products used. I use different penetration methods so my treatment doesn’t become formaldehyde, as I don’t burn the treatment onto the hair, as some stylist do through heat applications. I don’t recommend straighteners or other heated tools. It’s also up to the stylist to be responsible, as it’s possible for salons to measure formaldehyde levels, which I do.