Light, candy-colored, pastel hair were just some of the experimental colors that became popular in 2015 - so much so that beauty company L'Oréal came out with affordable and color-ready pastel dye treatments. However, hairstylists are now warning consumers that using the box dyes can be potentially harmful.

On Instagram, California hair and makeup artist Sydniiee Oliveira posted a PSA alerting consumers who might want to try the product, particularly L'Oréal's Féria line. "Your hair will melt right off your damn head if you even try to fix whatever it is this might do to you, and I will for damn sure not touch your hair if you even try it," she wrote in the post, along with photos of the product boxes.

The stylist further clarified that she has no ill-intentions against the beauty brand. "They make great professional products, but in my experience the Feria line, in any shade, has had the most extreme negative effects," she told Hello Giggles. Oliveira stressed that pastel hair colors "can't be achieved from a box" and, while the products are affordable, it can ruin one's hair.

The best way to get the look is to go for a salon treatment with a proper stylist who knows what to do. "Whatever you try to do to FIX what this does after you use it, will melt your hair off. I have seen it with my own eyes many times before! Literal heating, smoking and melting of the hair because [boxed dye] was on it before a color correction had to be done... So use at your own risk and don't be mad when we say 'I told you so,'" she further warned, per Seventeen.

Additionally, even if one does enlist the help of a trained colorist to apply the box dye treatment, it's still going to potentially become a hair disaster. Beverly Hills colorist Christie Silverman boosted Oliveira's claims by saying that box dyes contain ammonia, which is to be used in the coloring process. "People going into the store, they might not understand that, if they have dark hair and they put something like that onto it, it's going to lift it up to kind of an orange-y color. They're not gonna get the results that they want or that they see on the box," she told Hello Giggles.

The stylists stressed their warning isn't to dissuade people from doing DIY hair coloring treatments, but they have witnessed one too many clients coming to them for help after using store-bought dyes.