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    造成牙齒變黃的原因主要有兩大類：外在的和內在的。這可能是由一系列因素引起的，如藥物使用和清潔不足。外在污漬影響的是牙釉質表面，牙釉質是牙齒表面最堅硬的，是牙齒的最外層。雖然牙釉質很容易被沾上污垢，但這...
    
                
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