Happy World Smile Day! It's the perfect time to show those pearly whites. Click through for 40 celebrity snapshots sure to put you in the mood—starting with Tina Turner, whose amazing mid-'80s comeback put a smile on everyone's face.
John Travolta and Nancy Allen
Between takes on the set of 1976's "Carrie."
The soon-to-be Princess Grace aboard the SS Constitution, on her way to Monaco to marry Prince Rainer III in the 1956 "Wedding of the Century."
In the South of France for the 2016 Cannes Film Festival.
Paying a visit to his grandmother in 1949.
In the early '80s, enjoying a bit of downtime between "Urban Cowboy" and "An Officer and a Gentleman."
Sarah Jessica Parker
With husband Matthew Broderick in 1999, two seasons into "Sex & the City."
Eating ice cream and hanging out with her dog in the mid-'60s, before her breakthrough on "Rowan & Martin's Laugh-In."
Although he seems to be taking a happy pill in this 1960 photo, it's actually medication for a case of laryngitis.
It's the mid-'70s, and she obviously hasn't got time for the pain.
Flashing the famous killer smile in 1974, the year he starred in "Chinatown."
In 1974, a couple of years before "Taxi Driver."
Hard to believe she played a depressed housewife in 2007's "Premonition" around the time this photo was taken.
In the makeup chair during the filming of the 1970 Oscar winner "Midnight Cowboy."
In 1966—just a great year to be B.B.
With his face covered with coal dust for his role in 1970's "The Molly Maguires."
With her husband Mel Ferrer on a country road outside Paris in 1956.
In 1962, the year after she starred in "West Side Story."
At a 1998 wildlife benefit held at the Planet Hollywood in Beverly Hills.
In 1978, backstage after winning the Best Actress Oscar for "Annie Hall."
Paul Newman and Joanne Woodward
In 1963, five years into what would be a 50-year marriage.
On New Year's Rockin' Eve 1974.
The reggae legend in London, 1978.
Smiling guilelessly on the set of 1960's "Let's Make Love."
In 1990, a year after the release of "Indiana Jones and the Last Crusade."
At her San Francisco home in the fall following the Summer of Love.
Showing those dimples back in the '70s.
The King on the phone in his 1950s heyday.
In 2010, a big year for this Dame (she was in six movies).
In 1963, back when he was known as Cassius Clay.
The Divine Miss M in 1978.
Hanging with Kirk Douglas at a 1970 party, the King of Cool lightens up.
In the early '70s, and she doesn't seem "Blue" in the least.
In Stratford, Connecticut, for the 1957 American Shakespeare Festival.
In 2015. She hasn't changed a bit since George Costanza fell for her some 20 years ago.
Visiting Paris in 1958, the year she co-starred with Cary Grant in "Houseboat."
Just happy to be in London, 2002.
Relishing a moment during her 1967 tour of America.
In 1972, the year after she released "Tapestry."
She summed up the spirit of World Smile Day with this song back in the '50s: "When you're smiling / When you're smiling / The whole world smiles with you."
Plane crashes, overdoses, suicides and other sudden deaths that shook the music world
Just in case you don't remember everything that happened when he was young, wild and free
The actress and author best known as Princess Leia was brilliant, funny, honest and inspiring—often all at once
Classic creatures that still manage to give us the creeps
15 quotes from the rock and roll pioneer who could play the guitar just like ringing a bell
A monster mash-up of songs that are a graveyard smash