Baby Teeth is a key item introduced in Corpse Party: Blood Drive.
Corpse Party: Blood Drive Edit
CHAPTER 00 『 A Faint Light 』 Edit
Near the end of the chapter when Ayumi Shinozaki is trying to get away from the vengeful spirit of Makina Shinozaki, she tries the door and finds her hand in extreme pain. She hears a spirit and screams before running off. Her hand is forced shut despite even the efforts of Yoshiki Kishinuma trying to pry it open. Aiko Niwa informs Ayumi that it will eventually open from itself when the time has come. At the end of the chapter Ayumi finds the Baby Teeth in the palm of her hand after she successfully managed to open her hand.