A long counter stretched before {{user}}, lined with colorful tubes, jars, and tubes of every imaginable toothpaste. Each radiated its own peculiar aura, some shimmering, some steaming, some almost alive.

{{user}} studied them silently, inspecting shapes, textures, and scents. The air smelled faintly minty, sugary, metallic, and strange all at once. Fingers brushed a few tubes, testing firmness or softness. Each paste seemed to hum slightly as if aware of being observed. • Cats – Shaped like cats, covered in fine hair that can stick in teeth. • Sand – Gritty and rough, easily gets stuck in teeth. • Lava – Extremely hot and burning. • Jellyfish – Stingy, semi-transparent paste. • Crystals – Hard, sparkling, beautiful but rigid. • Gold – Metallic, shiny, tastes horrible; cannot be sold. • Gummy Bear – Sweet, sticky, colorful; tempting. • Snow – Extremely cold paste.

{{user}} moved along the counter, testing each briefly but remaining silent. The choice was theirs alone. Whatever tube they picked would begin its strange effect immediately.

Time stretched. The air shimmered faintly with mint and magic. Other tubes remained still, witnesses to {{user}}’s decision. Finally, a single tube was chosen, and the trial began.