刷牙是保护牙齿健康的基本手段，然而牙刷质量好坏至关重要。传统牙刷以尼龙丝为基本材料，丝毛坚硬，柔韧性不好，也给牙齿带来许多不健康的影响。比如，容易刺伤牙龈、损伤牙釉质、造成牙齿的楔形缺损、刷牙时出血等现象。近日，一种全新的２１世纪牙刷由韩国引入国内，这就 Brushing teeth is the basic means to protect the health of teeth, however, the quality of toothbrushes is essential. Traditional toothbrush to nylon filament as the basic material, silky hard, not good flexibility, but also to the teeth to bring many unhealthy effects. For example, easy to stab gums, enamel damage, resulting in wedge-shaped tooth defects, bleeding when brushing teeth and so on. Recently, a brand new 21st century toothbrush was introduced into Korea from Korea