A web list of movies from 1940s to 1979 with dentists can be found here
Ghost Town (2008) - Ricky Gervais, Greg Kinnear
Bertram Pincus, is a man whose people skills leave much to be desired. When Pincus dies unexpectedly, but is miraculously revived after seven minutes, he wakes up to discover that he now has the annoying ability to see ghosts. Ricky Gervais a dentist who can talk to the dead.
Good Luck Chuck (2007) - Dane Cook, Jessica Alba
Standup comedian Dane Cook stars in this romantic comedy as Charlie Logan, a successful dentist cursed with the affliction of having the women he dates fall in love with the next guy they meet.
The Whole Ten Yards (2004) - Bruce Willis, Matthew Perry
Jimmy the Tulip's (Willis) quiet new life is shaken up by his old pal Oz (Perry), whose wife (Henstridge) has been kidnapped by a Hungarian mob. The Tulip and his wife Jill (Peet) spring into action.
Finding Nemo (2003) - Bill Hunter voices the dentist
A father-son underwater adventure featuring Nemo, a boy clownfish, stolen from his coral reef home. His timid father must then travel to Sydney, and search Sydney Harbour find Nemo. Little Nemo ends up in a dentist's aquarium.
The Secret Lives of Dentists (2003) - Hope Davis, Campbell Scott
An introspective dentist's suspicions about his wife's infidelity stresses his mental well being and family life to the breaking point. Hope Davis and Campbell Scott play married dentists in this insightful dramatic comedy.
Snow Dogs (2002) - Cuba Gooding Jr.
When Dr. Ted Brooks, a successful, sun-loving dentist from Miami, receives a summons to the minuscule town of Tolketna, Alaska, his mother is forced to confess that he was adopted. Teddy's desire to quickly return to Miami yields to a burgeoning curiosity about his deceased mother and biological father. Teddy's experiences in Alaska acquaint him firsthand with the wonders of sled dogs, the sport of mushing, human sacrifice, and love. The city slicker's hilarious attempts to mush even culminate in a hero's reception at the finish of the prestigious "Arctic Challenge."
Novocaine (2001) - Steve Martin
A dentist finds himself a murder suspect after a sexy patient seduces him into prescribing her drugs. A film noir-like thriller with Steve Martin, also starring Laura Dern and Helena Bonham Carter.
The Whole Nine Yards (2000) - Bruce Willis, Matthew Perry
Nick is a struggling dentist in Canada. A new neighbor moves in, and he discovers that it is Jimmy "The Tulip" Teduski. His wife convinces him to go to Chicago and inform the mob boss who wants Jimmy dead.
Eversmile, New Jersey (1989) - Daniel Day Lewis
Traveling dentist, Fergus, travels across South America in search of teeth to clean while representing Eversmile foundation of New Jersey. Along the way, he encounters Estella who ends up hiding in his vehicle as a stoway and who ends up becoming his assistant. (special thanks to Susan Murray for letting us know about this film!)
Little Shop of Horrors (1986) A nerdishflorist finds his chance for success and romance with the help of a giant man-eating plant who demands to be fed. Steve Martin plays a jealous dentist in this deadly musical.
Compromising Positions (1985) - Susan Sarandon, Raul Julia
An ex-newspaper woman who is now a suburban housewife can't resist getting involved in an investigation of the murder of a philandering dentist who had been having affairs with several of her neighbors.
Cactus Flower (1969) - Walter Matthau, Goldie Hawn, Ingrid Bergman
Toni Simmons believes that the only reason her married lover won't leave his wife is because of the children. In truth, her lover, dentist Julian Winston, doesn't have any children. In fact, Julian doesn't even have a wife - he just tells women he does to avoid getting involved. When Julian does decide to take the plunge with Toni she insists on meeting the first wife and Julian enlists the aid of his long-time nurse/receptionist to play the part.
Sam the snowman tells us the story of a young red-nosed reindeer who, after being ousted from the reindeer games because of his beaming honker, teams up with Hermey, an elf who wants to be a dentist, and Yukon Cornelius, the prospector. They run into the Abominable Snowman and find a whole island of misfit toys. Rudoph vows to see if he can get Santa to help the toys, and he goes back to the North Pole on Christmas Eve. But Santa's sleigh is fogged in. But when Santa looks over Rudolph, he gets a very bright idea.
Dentist in the Chair (1960)
In this British comedy, two dental students become mixed up in the misadventures of a thief whenhe tries to sell them stolen dental equipment. (Wikipedia)
The Dentist (1932) - W.C. Fields
Fields plays an unconventional dentist who deals with patients in slapstick fashion.