Rini and Bunny eat sweet snacks after school, dessert after dinner, and more sweet snacks later on that night. The next morning, Rini isn't feeling well and her friend Momoko offers her a soda to drink, but this only makes Rini feel worse.

After school, Amy examines Rini and discovers that both she and Bunny have a cavity. The other girls scare Rini with their cavity stories when they find the younger girl does not know what they are. At home, Bunny's mom is upset with them for having the cavities since the girls did not brush their teeth.

The next day, Bunny's dad takes them to the dentist, but the very old office and the ancient dentist hobbling around scare them all a bit, and they decide to firm up their courage and come back the next day. As they leave, a spirit appears, Regin, who lives off the pain of cavities. She complains there aren't enough cavities of late and wants to make more.

In the morning, an ad runs for the dentist as a grand reopening with a new, cute dentist. Mina sees this and joins the Tsukinos in their trip this time. In the waiting room, they are fed sweets and fall asleep to the music playing as Rini goes in to her appointment.

When Rini sits in the chair, the arms close around her, trapping her. The dentist and assistant want to give her more cavities. Diana breaks Rini free and she transforms. As Super Sailor Chibi Moon fights the cavity-bringing bad guys, Diana wakes the other girls who transform. Super Sailor Moon and Sailor V burst into the room. The three girls finish off the sweet spirit and the office goes back to it's normal old self- including the dentist. Bunny and Rini still have their appointments, but Mina decides to see her own dentist after all.

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