| 摘要 |
<p>The brush system has two toothbrush types where a degree of hardness of the first toothbrush type and a degree of hardness of the second toothbrush type differ around at least 1 cN per mm 2. The toothbrushes (1) have the same diameter with bristles (6) made from the same filament material and differ by the middle length of the bristles (6). The tooth brush has a brush head (3) and a grip (2). The filament material is made from a polyester.</p> |
