Fundamentals of Dry Shampoo

Imagine those mornings when you repeatedly hit the snooze button, leaving you with barely enough time to dress and dash to work. Ironically, these rushed moments often coincide with your worst hair days, as the sebaceous glands in your scalp release an excessive amount of oil. This oil, a mix of dead skin cells, sweat, and airborne particles, weighs down your 100,000 to 120,000 hairs, creating a chaotic look reminiscent of Calvin from the Calvin & Hobbes comic strip [source: Zviak]. With no time for a proper shampoo and style, your hair remains unruly.

Don't panic. Hair care innovation offers a brilliant solution: dry shampoo. This water-free product allows you to refresh and style your hair quickly. Simply apply it to your hair, let it absorb the oil and dirt, and then brush or blot it away. Fans of dry shampoo, a growing community, claim that top brands can give your hair a glossy, voluminous look comparable to a full wash [source: Kato]. Additionally, experts warn that daily shampooing with detergent-based products may strip your hair of essential oils, a concern for the 80% of Americans who wash their hair daily [source: Bouillon]. Many are now adopting the once-a-week washing routine popular in past decades, relying on dry shampoos to maintain their look between salon visits [source: Grossman].

Is their advice genuine, or are they simply aiming to attract weekly salon visitors? What are the advantages and disadvantages of using dry shampoo?

Dry Shampoo -- No-wash Cleaning

Hair washing dates back to at least 2000 B.C., when Egyptians created what might be the earliest shampoo using citrus juice, animal fats, and plant oils to restore hair's shine. It's likely that the phrase, "I just washed my hair and I can't do a thing with it," was first uttered around this time. Over the centuries, those dissatisfied with the drying and frizzing effects of wet shampoo have experimented with various post-wash treatments. For instance, 12th-century European women preferred a conditioner made by boiling dead lizards in olive oil [source: Scott]. They also criticized the inconvenience, effort, and sometimes unappealing outcomes of wet shampooing and drying.

"Wet shampooing is inherently exhausting," a New York Times writer complained in a 1909 article. The newspaper noted that Parisian stylists at the turn of the 20th century had developed a peculiar alternative: treating clients' hair with a blend of gasoline and ether fumes, applied near a window with an electric fan to minimize explosion risks [source: NYT].

Eventually, hair care experts devised a safer solution. Rather than using detergent and water to remove oil from hair, they focused on absorbing it—similar to how talcum powder absorbs moisture from the skin. This concept wasn't entirely novel: Asians had used clay powder in their hair for centuries, and 18th-century French women powdered their hair for color [source: Berg]. The 1918 edition of the American Journal of Pharmacy detailed a dry shampoo recipe containing rice flour, advising users to "sprinkle it into the hair and brush it out thoroughly, ensuring the brush reaches the ends of the hair" [source: American Journal].

Over time, a variety of dry shampoo products have emerged, incorporating starches, clays, vegetable powders, and oil-absorbing chemicals [source: Bouillon]. These products are available in sprinkle or aerosol spray forms. Dry shampoos gained significant traction in the 1970s, a time when consumers were captivated by time-saving innovations. However, their popularity declined afterward [source: McCoy]. Recently, they have made a comeback, a trend we'll explore in the next section.

Why are dry shampoos gaining popularity?

A drawback of dry shampoos is that while they effectively remove much of the buildup from your hair, they don't cleanse as thoroughly as wet shampooing [source: BeautyBrains]. Wet shampooing not only helps oil form droplets and wash away but also alters the oil-secreting process, slowing the spread of oil from your scalp to your hair [source: Zviak]. Beauty author Edain McCoy notes, "If your hair is extremely dirty, using too much dry shampoo can strip away its natural shine, leaving it looking like you've stepped out of the 18th century with a powdered wig" [source: McCoy].

Despite this, dry shampoos are experiencing a resurgence in popularity. Modern hair care innovators are reviving an old belief that daily shampooing harms hair. They advocate for spacing out wet shampoos by several days or even weeks, relying on dry shampoos in between. Some enthusiasts have even abandoned wet shampoos entirely, opting exclusively for dry powder alternatives [source: Grossman].

Even if you prefer traditional wet shampoo, stylist Robert Vetica recommends dry shampoos for those with fine, fragile hair. He advises using an aerosol dry shampoo as a quick refresh for your hairstyle after a long workday before heading out. "Hair tends to lose its shape as the day progresses," he explains. "Apply dry shampoo, let it sit for a few minutes to absorb oils, and then brush it out thoroughly" [source: Vetica].

One downside of dry shampoos is the cost, with high-end brands selling for up to $24 for a 3.2-ounce bottle. However, more affordable options are available. Beauty expert McCoy recommends a budget-friendly DIY solution: using cornstarch. Apply a small amount to your hair, focusing on the roots, and blend it in carefully [source: McCoy].