To keep gums in tip-top shape, use a soft bristle brush and work in up-and-down strokes, focusing on one quarter of the jaw at a time.

• 要让牙龈保持最佳状态，应使用软毛牙刷，也要上下来回轻刷，牙刷每次刷到的面积是口部的四分之一左右。