Generate a poster on the water flow cleaning principle of the water flosser, without the need for the complete product body. The background is a gradient from clean white to light icy blue, with three rows of bright blue sans-serif on the top left titled "Fine Water Flow / Deep Tooth Gap / Refreshing and Clean." In the top right, two black dotted points are displayed side by side: "Sparkling water flow / gently removes tooth residue" and "Pulse rhythm / more comfortable for daily use," without specifying the frequency or absolute cleaning percentage. The lower half of the image shows a row of rounded, white teeth models, with a semi-transparent nozzle in the foreground extending from the lower left, spraying a clear pale blue stream that passes between the two teeth; A small number of light bubbles and a very small number of abstract particles are carried away in the water flow. The edges use soft blue reflections, keeping the image fresh without being overly medical. The font is large and clear, so the water flow can't obscure the selling point; Avoid original image numbers, brands, small footnotes, watermarks, and rounded screenshot boxes.