Hey Miley Cyrus, please do not wear someone else's retainer

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When you wear your bffs retainer lol

A photo posted by Miley Cyrus (@mileycyrus) on

It's refreshing to see an influential celebrity embracing orthodontics, like Gwen Stefani wearing braces in the '90s.

Kids are are insecure about their very expensive retainers and it helps to see someone confidently rocking a metal mouth. Seriously, those things cost money — don't ditch them.

And while Miley Cyrus's efforts for the cause are certainly enthusiastic, they are misguided. Because you're only supposed to wear orthodontic gear fitted for your own mouth.

Do we really have to explain why wearing someone else's retainer, even as an act of friendship, is a bad idea? Long-term use of a retainer that belongs to someone else can rearrange your teeth in a way you may not like and short-term use is unsanitary. Don't be gross.

Miley knows what it's like to have the eyes of the world on her mouth — the sometimes home of her tongue. With great power comes great responsibility.

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Miley Cyrus every time she stuck her tongue out
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Hey Miley Cyrus, please do not wear someone else's retainer
SAN JOSE, CA - SEPTEMBER 19: Miley Cyrus performs at the HP Pavilion on September 19, 2006 in San Jose California. (Photo by Tim Mosenfelder/Getty Images)
HOLLYWOOD - APRIL 06: Singer Miley Cyrus performs during the taping of Idol Gives Back held at the Kodak Theatre on April 6, 2008 in Hollywood, California. Idol Gives Back will air April 9, 2008 (7:30-10:00 PM ET/PT) on FOX. (Photo by Kevin Winter/Getty Images)
NEW YORK - JULY 18: Actress and singer Miley Cyrus co-hosts MTV's 'TRL' at the MTV studios in Times Square on July 18, 2008 in New York City. (Photo by Michael Loccisano/FilmMagic)
NEW YORK - JULY 25: Singer Miley Cyrus performs on NBC's 'Today' at Rockefeller Plaza on July 25, 2008 in New York City. (Photo by Michael Loccisano/FilmMagic)
LOS ANGELES, CA - AUGUST 03: Host Miley Cyrus performs during the Choice Music award onstage during the 2008 Teen Choice Awards at Gibson Amphitheater on August 3, 2008 in Los Angeles, California. (Photo by K Winter/TCA 2008/Getty Images for Fox)
LOS ANGELES, CA - SEPTEMBER 07: Singers Katy Perry & Miley Cyrus and Tish Cyrus arrives at the 2008 MTV Video Music Awards at Paramount Pictures Studios on September 7, 2008 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - MARCH 28: Singer/actress Miley Cyrus arrives at Nickelodeon's 2009 Kids' Choice Awards at UCLA's Pauley Pavilion on March 28, 2009 in Westwood, California. (Photo by Kevin Mazur/WireImage)
LONDON - APRIL 23: Miley Cyrus sighting on April 23, 2009 in London, England. (Photo by Tom Wargacki/WireImage)
UNIVERSAL CITY, CA - AUGUST 09: Singer Miley Cyrus arrives at the Teen Choice Awards 2009 held at the Gibson Amphitheatre on August 9, 2009 in Universal City, California. (Photo by Steve Granitz/WireImage)
LOS ANGELES, CA - MARCH 12: Singer Miley Cyrus arrives at the Los Angeles Premiere 'The Hunger Games' at Nokia Theatre L.A. Live on March 12, 2012 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
NEW YORK, NY - JULY 15: Actress and singer Miley Cyrus tapes an interview at 'Good Morning America' at the ABC Times Square Studios on July 15, 2013 in New York City. (Photo by Ray Tamarra/Getty Images)
LONDON, ENGLAND - JULY 18: Miley Cyrus sighted at BBC Radio 1 on July 18, 2013 in London, England. (Photo by Ben Pruchnie/FilmMagic)
UNIVERSAL CITY, CA - AUGUST 11: Miley Cyrus poses at the 2013 Teen Choice Awards at Gibson Amphitheatre on August 11, 2013 in Universal City, California. (Photo by Steve Granitz/WireImage)
NEW YORK, NY - AUGUST 25: (EXCLUSIVE COVERAGE) Miley Cyrus attends the 2013 MTV Video Music Awards at the Barclays Center on August 25, 2013 in the Brooklyn borough of New York City. (Photo by Kevin Mazur/WireImage for MTV)
NEW YORK, NY - AUGUST 25: Robin Thicke and Miley Cyrus perform during the 2013 MTV Video Music Awards at the Barclays Center on August 25, 2013 in the Brooklyn borough of New York City. (Photo by Kevin Mazur/WireImage for MTV)
LAS VEGAS, NV - SEPTEMBER 21: Miley Cyrus and Tish Cyrus attend the iHeartRadio Music Festival Village on September 21, 2013 in Las Vegas, Nevada. (Photo by Kevin Mazur/Getty Images for Clear Channel)
LAS VEGAS, NV - SEPTEMBER 21: Entertainer Miley Cyrus winks and sticks out her tongue as she performs during the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for Clear Channel)
NEW YORK, NY - OCTOBER 07: Miley Cyrus performs on NBC's 'Today' at Rockefeller Plaza on October 7, 2013 in New York City. (Photo by Kevin Mazur/WireImage)
TODAY -- Pictured: Miley Cyrus appears on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
NEW YORK, NY - OCTOBER 08: Miley Cyrus attends the Miley Cyrus 'Bangerz' Record Release Signing at Planet Hollywood Times Square on October 8, 2013 in New York City. (Photo by Laura Cavanaugh/FilmMagic)
AMSTERDAM, NETHERLANDS - NOVEMBER 10: Miley Cyrus backstage at the MTV EMA's 2013 at Ziggo Dome on November 10, 2013 in Amsterdam, Netherlands. (Photo by Kevin Mazur/WireImage)
LOS ANGELES, CA - NOVEMBER 24: Singer Miley Cyrus attends the 2013 American Music Awards at Nokia Theatre L.A. Live on November 24, 2013 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - DECEMBER 06: Singer Miley Cyrus performs onstage during KIIS FMÂs Jingle Ball 2013 at Staples Center on December 6, 2013 in Los Angeles, CA. (Photo by Kevin Mazur/Getty Images for Clear Channel)
LAS VEGAS, NV - DECEMBER 27: Entertainment host Jeff Beacher (L) and entertainer Miley Cyrus arrive at the premiere of Beacher's Madhouse Las Vegas at the MGM Grand Hotel/Casino on December 27, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
BEVERLY HILLS, CA - JANUARY 25: Recording artists Miley Cyrus and Pharrell Williams attend the 56th annual GRAMMY Awards Pre-GRAMMY Gala and Salute to Industry Icons honoring Lucian Grainge at The Beverly Hilton on January 25, 2014 in Beverly Hills, California. (Photo by Larry Busacca/Getty Images for NARAS)
HOLLYWOOD, CA - JANUARY 28: Recording artist Miley Cyrus performs onstage during Miley Cyrus: MTV Unplugged at Sunset Gower Studios on January 28, 2014 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic for MTV)
VANCOUVER, BC - FEBRUARY 14: Miley Cyrus performs onstage during her 'Bangerz' tour at Rogers Arena on February 14, 2014 in Vancouver, Canada. (Photo by Kevin Mazur/WireImage)
LOS ANGELES, CA - FEBRUARY 22: Miley Cyrus performs at Staples Center on February 22, 2014 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
MIAMI BEACH, FL - DECEMBER 04: Miley Cyrus attends Jeremy Scott & Moschino Party with Barbie on December 4, 2014 in Miami Beach, Florida. (Photo by Venturelli/WireImage)
INGLEWOOD, CA - DECEMBER 14: Miley Cyrus attends The 25th Annual KROQ Almost Acoustic Christmas - Day 2 at The Forum on December 14, 2014 ingInglewood, California. (Photo by Gabriel Olsen/Getty Images for CBS Radio)
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