Ever since apes discovered perms in the late ’90s, straightening treatments have been the only thing that separates us from the animals. Assert primate dominance with this Groupon.

Choose Between Two Options

• $86 for an express keratin blowout (a $175 value)
• $129 for a classic keratin blowout (a $350 value)

In both express and full-length keratin treatments, skilled stylists eliminate frizz and fortify strands, leaving locks shinier, straighter, and easier to style for up to six months.

Some hair-straightening products that claim to be formaldehyde-free include aldehyde compounds, which are similar to the carcinogen formaldehyde. Side effects may include nosebleeds, headaches, vomiting, and respiratory problems, among others. Learn more about the health risks here.

Lather Chicago

Lather Chicago caters to hairstyling needs at three boutique salon locations throughout the city. Experienced stylists adeptly trim, sculpt, and color hair, eschewing the overly formal atmosphere and automated mustache twirlers found in many modern salons. Shelves display a colorful phalanx of high-end tress treatments, such as paraben- and sulfate-free Kevin Murphy products, hair coloring from independent Dutch producer Keune, and hair-conditioning solutions from Moroccanoil and Unite. When not catering to their clients' specific aesthetic needs, hair therapists host free events such as hairstyling and drying tutorials.