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Healthy pink gums contrasted with dark, discolored gums. Close-up shot, focusing on the gum line and teeth. Illustrates the effects of smoking, melanin, and poor oral hygiene on gum color. Include a toothbrush in the scene for context. Japanese text overlay: "歯茎の色の変化、原因と対策" (Gum Color Changes: Causes and Solutions). Style: Clean, clinical, informative.

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歯茎のホワイトニングで損しないための裏ワザ、知らなきゃもったいない!

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最近、鏡を見るたびに歯茎の色が気になって ...