It is commonly believed that tooth decay becomes active at night, feasting on food particles lodged between teeth. To prevent tooth decay, it is essential to diligently brush your teeth thoroughly before bedtime.

Bi Bi exemplifies this diligence in oral care. Before retiring for the night, she entered the bathroom, retrieved a toothbrush and toothpaste, and commenced brushing her molars. The worms, preoccupied with consuming leftover food, hastily alerted another to seek refuge between her teeth as Bi Bi applied toothpaste. "Oh my god, it's so spicy..." cried the worms as they succumbed to the toothpaste's effects. Bi Bi rinsed her mouth, expelling the cavities. However, a few mischievous individuals lingered deep within her teeth, unharmed. The dentist joyfully exclaimed, "I like it so much. Please use calcium to make me harder!"

On a day when Bi Bi felt nauseous and chose not to brush her teeth, she was advised to rinse her mouth instead. Taking a sip of water, the worms, accustomed to toothpaste, alarmed each other. However, with no familiar toothpaste pouring in, they settled down, planning to become active once night fell.

In the silence of the night, the worms emerge, clinging to Bi Bi's molars and chiseling away. The mandible, though in pain, resisted, causes the worms to fall. Despite their persistence, the lead worm's call to "make a hole together" was thwarted by the resilient mandible. Bi Bi, disturbed in her sleep, found herself in a forest surrounded by wolves. Amidst the panic, a voice from the sky revealed itself as the tooth god, chastising her for neglecting oral care. In response, Bi Bi promised to maintain proper dental hygiene.

On another occasion, feeling nauseous, Bi Bi rinsed her mouth without brushing. The cavities, alarmed by the absence of toothpaste, emerging cautiously. To their surprise, a sticky substance entrapped them, followed by the overpowering minty aroma and spicy taste of mint. The gum doctor, seizing the opportunity, subdued the tooth decayers, leaving only a few elusive worms deep within the tooth roots.

successively, Bi Bi, feigning nausea, continuously choosing for gum over toothpaste. This respite allows the tooth decayers to multiply and wreak havoc, causing distress for dentists. Grandpa, concerned about the screams from Bi Bi's mouth, insisted on a dental examination, revealing two molars with black dents. Panicked, Bi Bi cried, prompting Grandpa to reassure her and schedule a dental treatment.

At the dental clinic, the doctor commended Bi Bi for her cooperation during the treatment, which involved drilling, sharpening, rinsing, and sealing cavities. The doctor emphasizes the importance of regular tooth brushing, advising against using gum as a substitute for toothpaste. Armed with a newfound awareness, Bi Bi committed to preserving her teeth.

Upon returning home, Bi Bi eagerly requested to brush her teeth with the provided toothpaste. The dentist panicked at her enthusiasm, cautioning against excessive force. Bi Bi, learning the proper technique, acknowledged that brushing too vigorously could be harmful.

Henceforth, Bi Bi became knowledgeable about dental care, adopting practices to maintain the health and aesthetics of her teeth, ensuring they remain white and beautiful.