The 1 product you should never put in your hair

6 Beauty Products You Should Trash After College

On the surface, 2-in-1 shampoo and conditioner seems to make logical sense: Why buy both shampoo and conditioner separately when you can condense them into one easy step, saving both time and money in the process?

Well the best reason is that 2-in-1 just doesn't work the way it's supposed to.

SEE ALSO: Meet the photographer whose colorful food gradients has turned her into an Instagram phenomenon

"2-in-1 shampoo and conditioner products simply do not work," Daniel Davies, manager at the Pall Mall Barbers chain of barbershops in London, told

It all comes down to your cuticles, which are the "scale-like" outermost layers of your hair that manage the hair's water content. It is your hair's first line of defense, and contribute the shine to healthy hair.

Shampoo's purpose is to clean by opening the cuticles to release any dirt trapped in the hair.

This also releases the natural hair oils, leaving the hair quite dry. A conditioner's purpose, then, is to re-moisturize the hair and close those opened-up cuticles, giving hair a shiny and healthy look.

The problem with 2-in-1 is that "a single product cannot open and close the cuticle at the same time," Davies said.

The hair gets cleaned, but the "conditioner" part of the product only coats the hair with silicone, which doesn't "close" the hair's cuticles.

The result is an extremely frizzy head of hair that is hard to manage, and will need to be washed more often.

Looking to try some curls on your head? Check out the celebs who rock them best:

Celebs who rock curly hair
See Gallery
The 1 product you should never put in your hair
NEW YORK, NY - SEPTEMBER 26: Beyonce performs onstage during 2015 Global Citizen Festival to end extreme poverty by 2030 in Central Park on September 26, 2015 in New York City. (Photo by Theo Wargo/Getty Images for Global Citizen)
LAS VEGAS - MAY 23: Country singer Taylor Swift arrives at the 41st Annual Academy Of Country Music Awards held at the MGM Grand Garden Arena on May 23, 2006 in Las Vegas, Nevada. (Photo by Michael Buckner/Getty Images)
LOS ANGELES, CA - OCTOBER 24: Zendaya attends the Just Jared fall fun day on October 24, 2015 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - OCTOBER 20: Uzo Aduba attends the The House Of Remy Martin 'One Life/Live Them' Launch Event With Jeremy Renner at ArtBeam on October 20, 2015 in New York City. (Photo by Daniel Zuchnik/Getty Images)
HOLLYWOOD, CA - APRIL 15: Actress Jenny Slate arrives at the Los Angeles premiere of 'Adult Beginners' at ArcLight Hollywood on April 15, 2015 in Hollywood, California. (Photo by Gregg DeGuire/WireImage)
LOS ANGELES, CA - OCTOBER 30: Actress Naya Rivera arrives at the UNICEF's Next Generation's 2nd Annual UNICEF Masquerade Ball on October 30, 2014 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
MILAN, ITALY - SEPTEMBER 17: Nicole Kidman attends OMEGA 'Her Time' Q&A session at Palazzo Parigi on September 17, 2015 in Milan, Italy. (Photo by Jacopo Raule/Getty Images for OMEGA)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0324 -- Pictured: Jessica Simpson on September 8, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - AUGUST 06: Sarah Jessica Parker attends the Broadway Opening Night Performance of 'Hamilton at the Richard Rodgers Theatre on August 6,, 2015 in New York City. (Photo by Walter McBride/WireImage)
LOS ANGELES, CA - NOVEMBER 07: Actress Salma Hayek arrives at the LACMA 2015 Art+Film Gala Honoring James Turrell And Alejandro G Inarritu, Presented By Gucci at LACMA on November 7, 2015 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)
BARCELONA, SPAIN - SEPTEMBER 06: Shakira performs on stage during the concert of Mana at Palau Sant Jordi on September 6, 2015 in Barcelona, Spain. (Photo by Xavi Torrent/WireImage)
NEW YORK, NY - SEPTEMBER 16: Mariah Carey attends the 2015 Harper's BAZAAR ICONS Event at The Plaza Hotel on September 16, 2015 in New York City. (Photo by Dimitrios Kambouris/WireImage)

NOW WATCH: The most controversial men's hairstyle of 2015

See Also:

SEE ALSO: Here's exactly how long guys should go in between haircuts

DON'T FORGET: Follow Business Insider's lifestyle page on Facebook!

Read Full Story