Like an arrow, hair that isn’t perfectly straight can have disastrous results, such as slapping unsuspecting passersby or starting unplanned medieval brawls. Protect innocent bystanders with today’s Groupon: for $120, you get a keratin hair-straightening treatment at The Salon in Flowood (a $240 value).

The Salon’s keratin treatment straightens unruly strands and wavy manes, resulting in silky-smooth tresses free of frizz and flyaways. The three-hour haircare therapy commences with the application of a specialized shampoo and the keratin treatment over the full length of head threads. Wielding a blow dryer, flatiron, and heat-producing Jedi mind tricks, a friendly coiffeuse seals keratin into each individual hair shaft, resulting in glossy, manageable locks that look shampoo-ad worthy for up to six months. The safe treatment replenishes keratin deficiency to strands and reduces dry time by half, freeing up hair dryers for more important tasks, such as heating coffee or warding off irritable snowmen. To protect and maintain newly straightened coifs, The Salon recommends regular use of keratin shampoo and conditioner ($40) and the Keratin Silky & Smooth spray.

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.