Caries, a cavity, remodels Ame's teeth without asking and pushes her around. Seeing that Ame can't fit in with her friends, Caries tries to solve it with her specialty: DIY.

Ame is happy that her baby tooth fell out. But that was Caries' precious TV! Caries carefully nurtures the newly growing tooth, eventually growing it into a giant TV, but...

Ame is banned from eating sweets by her mom. Unable to watch Caries suffer from not eating sweets, her friend Mikan secretly gives them sugar, but they get involved in unexpected trouble.

When Ame wakes up, Caries and a mysterious fish, Harold, are flirting inside her mouth! Ame doesn't accept Harold, who claims to be Caries' boyfriend. However, Caries is head over heels for Harold...

Believing the rumor of the Tooth Fairy who "exchanges lost teeth for money," Ame and friends sleep with teeth under their pillows. But they were all stolen! Caries stands up for the sake of the children.

Mom took Ame to... the dentist!? If the cavity is found, it's game over! Ame and Caries panic and frantically clean up Caries' room, but...

Ame finds a toy she wants and tries throwing a tantrum imitating Mikan and the others, but she isn't making enough noise to get it bought. Unable to watch, Caries helps her out, but...

The real Tooth Fairy got caught in the trap set to catch the tooth thief!? They immediately try to exchange the lost tooth for money, but the Tooth Fairy's assessment is stricter than imagined.

Caries fights with Ame and storms out of the room. She relies on Mikan and the others, trying to get them to let her stay in their mouths, but...

A massive amount of teeth growing inside Caries' room! It seems Ame entered a cursed place. To increase the teeth, Caries tries various curses on Ame.

Ame and Caries write letters for what they want for Christmas. However, the presents don't arrive, and Caries gets depressed. Just then, a certain surprise arrives.

The city is attacked by aliens! Ame and friends are abducted by a UFO and are in a huge pinch. Can they escape from the UFO with Mikan and Beef...?

Ame sighs, unable to hand an envelope to a certain man. "Could it be Mom's first love!?" Caries goes to deliver the love letter in Ame's place.

Harold has a secret child!? Caries is furious, but it was actually a baby living inside Harold's mouth. Caries is entrusted with the baby and struggles with parenting for the first time.

Caries becomes famous as a new species of UMA due to a video Mikan posted. A large crowd rushes to Ame's house to catch a glimpse of Caries.

Ame tries to pull out a loose baby tooth. Caries, not wanting her furniture removed, remodels the baby tooth into a security AI robot, "Giga-Teeth," but...

The children enjoy a food tour. However, they are refused entry at a high-end restaurant. Caries comes up with a plan for the sad Ame and friends.

Ame catches a cold and is bedridden. Caries dives into Ame's body to search for the cause of the cold and finds a virus tormenting Ame there.

Because she forgot to brush her teeth, a massive number of Caries clones appear!? Caries is pushed around by the clones living as they please inside Ame's mouth...

Mikan does a livestream closely following Caries' life. Caries struggles to make a cake during the stream, but she can't gather the ingredients as she hoped...

A no-rules kart race is held where racers proceed while getting sweets on the course. Using every trick in the book to overtake rivals, who on earth will take first place!?

Caries has left Ame's mouth. It seems Caries has become independent. To let go of her child, Ame resolves to undergo the dental treatment she hates...

Mikan and friends celebrate Ame's birthday. Everyone has fun making a candy house together, but Ame looks a little lonely without Caries...