Having frizzy, unkempt hair can make you appear disoriented and unhinged during job interviews, first dates, and shouting matches with the neighbor's bush. Keep it together with today's Groupon: for $130, you get a keratin hair treatment at Thru Luna's Eyes in Ferndale (up to a $300 value).

The small troop of stylists at Thru Luna's Eyes artfully smoothes pleated locks with a generous application of California Smooth keratin treatment. Dimension-thieving sessions ameliorate natural or chemically treated hair and typically take effect over 2.5 hours or more, depending on hair length and condition. A creamy blend of quinoa proteins and amino acids trounces frizzy tendencies and preempts tendrils' natural proclivity to braid themselves around hoop earrings. Flourishes of mango butter and grape-seed oil deeply condition tresses to facilitate a bodied, easy-to-style 'do. Results can last up to three months if patrons do not shampoo or color hair for 72 hours after the treatment and avoid exposing locks to the wayward influences of crinkle-cut fries.

Some hair-smoothing 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.