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According to the report, colour is important, and too many are now bleached too white. Dr Davis said： "The teeth should be the same colour as the whites of your eyes. If the teeth are too white, they become more dominant than the eyes."There are strict mathematical ratios governing the ideal smile, says Dr Davis. Its width should be no less than half the of the face at the same height and, for the best effect, both upper and lower lips need to be symmetrical each side of the mid-line of the face.
根據報告，顏色是很重要的，但現在不少人為擁有明眸皓齒不惜過渡漂白。戴維斯博士說：“牙齒與雙眼最好一樣白。如果牙齒太白，就會喧賓奪主。”戴維斯博士還表示，完美笑容有嚴格的數字比例。張開的嘴寬度不能小過半邊臉的寬度，上唇與下唇兩邊嘴角要對稱，如此才能交出最完美的笑容。
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