A close-up Instagram photo of a person with bright white teeth, applying vibrant purple teeth whitening paste with a toothbrush. The paste contrasts against the gleaming white teeth, emphasizing the whitening effect. The purple paste is thick and glossy, with a slightly playful, fun vibe. Soft lighting highlights the shine of the teeth and the smooth texture of the paste, while the focus stays on the mouth area to create an attention-grabbing and bold visual perfect for an advertisement