"Hail to the Teeth" is the 11th episode of the thirty-first season of the American animated television series The Simpsons, and the 673rd episode overall. Being the first episode to air in the 2020s, it aired in the United States on Fox on January 5, 2020.^[1] The episode was written by Elisabeth Kiernan Averick and was directed by Mark Kirkland.^[1]

Artie Ziff invites Homer and Marge to his wedding. Although both are conflicted about going due to the number of times Artie has tried to break them up, they reluctantly accept the invitation. Homer goes alone to the bachelor party, where he finds Artie has regained his wealth after his parole, selling burning cash-resembling fireplaces. Attending the ceremony with Marge, Homer gives the bride away, only to find out that the bride looks just like Marge. Unsettled, Marge leaves the ceremony, and later decides to tell the bride that Artie only married her because she and Marge look alike. She and Homer get to the honeymoon suite and find out that the marriage was a ruse and Artie's bride is a robot. Artie admits he had been trying to make a robot clone of Marge for years, but they all have flaws. Following Marge's suggestion, he uses his army of Marge droids to do humanitarian work, though they all reject his sexual advances, with some sprouting wings to fly off.

Meanwhile, Lisa is heckled by a man who claims that she will be prettier and more popular if she smiled more often. Marge takes her to a new dentist to get a new set of braces, as her old dentist was a rogue periodontist masquerading as an orthodontist. The top half of her braces cause her to constantly smile and finally win popularity among her classmates. Initially disgusted by the shallowness of the concept, Lisa decides to bank on her newfound popularity and run for class president. Unfortunately, the other half of her braces are installed, resulting in her now constantly frowning for the next six months. Bart hires Martin Prince to manipulate a live feed of Lisa doing her election speech to make her smile, but the app malfunctions and Lisa exposes herself, causing her to lose the election to Dubya Spuckler. Outside in the school playground, Marge attempts to comfort Lisa, only to witness the same man heckle her for not smiling. Marge then sprouts robotic wings and attacks the man while Lisa smiles and cheers her on.

This is the first episode of the series written by Elisabeth Kiernan Averick.^[2]