Abstract: A device for aiding and encouraging a child to brush his or her teeth regularly. The device is provided with a pair of nonrotatable shafts each of which mounts seven rotatable blocks shaped like a molar tooth, each block representing either the morning or night of a particularly day during which a child should brush his teeth. The front surface faces of the blocks form a frowning mouth with dirty teeth, while the rear surface faces form a pattern of a smiling mouth with white teeth after all of the blocks have been rotated 180 degrees. Each block is rotated to expose a portion of the smile and to remove a portion of the frown after each tooth brushing in the morning and evening of each day.