Before modern hair treatments, frizzy hair could only be smoothed by pressing it with an iron or by running it through the fingers of a jazz pianist. Achieve a noteworthy ‘do with today’s Groupon to Metro Hair Studio. Choose between the following options:

• For $30, you get $60 worth of salon services of your choice.
• For $175, you get a full Brazilian keratin treatment (a $350 value).
  
  

Led by Vincenzo, a 26-year-veteran of the styling business, Metro Hair Studio’s trained staffers enhance appearances with hair-smoothing Brazilian treatments and a variety of salon services. Decadigits lounge in a tonic salt soak during a Metro mani-pedi ($55) before submitting to the classic file, buff, and de-finger-puppeting. Technicians then coat phalangeal appendages in an exfoliating sugar scrub and luxurious heat mask before massaging and polishing hands and feet. Waxing services free eyebrows ($15) or lips ($15) of unwanted hair or recurring fake mustaches, and haircuts ($55) sculpt coiffures into stylish new shapes. Salon guests who opt for the full Brazilian keratin treatment can retexturize hair of any type, including short hair, damaged hair, and Victorian powdered wigs. The salon’s Beox keratin products condition strands from root to tip, imparting shine and restructuring tresses to immediately hang in a straighter, more orderly fashion for up to four months.

Some Brazilian blowout products include the carcinogen formaldehyde, which may cause nosebleeds, headaches, vomiting, and respiratory problems, among other side effects. Learn more about the health risks here.