Everything You Need to Know About Keratin Treatments

Although she has natural curls, Meghan Markle is reportedly a fan of the beauty service. Her former London-based hair stylist Theonie Kakoulli at Nicky Clarke said she does keratin treatments to maintain her currently preferred straight and silky look. "Meghan came to see me at least twice for keratin treatments," Kakoulli told PEOPLE. "It’s great for people with naturally curly hair like Meghan, it takes the frizz out and makes it more manageable—she said it made a real difference."

Read on for answers to other questions we're sure you're asking about the popular treatment.

Formaldehyde is required to get the hair straight. While the chemical has a bad rap (it is a carcinogen that could possibly cause respiratory problems if exposure is frequent), "we always make sure that when you get the treatment, you're sitting close to a door, or in a well-ventilated room," de Zeeuw says. It is also suggested to wear protective glasses for sensitive eyes, which might start welling.

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