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: for $149, you get a signature keratin treatment at Silver Spring Hair Scalp & Wellness Clinic in Silver Spring (a $500 value).

Kelina Baltimore, the president and expert stylist at Silver Spring Hair Scalp & Wellness Clinic, blends protein, plant extracts, and vitamins into a special keratin formula, which she alchemizes herself. Kelina's potion, when applied directly to damaged hair, works to repair the strands damaged by harsh styling techniques, blow-drying, and the elements, such as sun, wind, and in-home salt storms. The soothing elixir is completely free of harmful aldehydes and leaves tresses feeling silkier, stronger, and straighter.