| 摘要 |
A toothbrush is described whose head has a different design in comparison to a conventional flat-trimmed toothbrush in that the heights of the bristles are arranged to create a concave cylindrical brushing surface at the free ends of bristles which has a curvature approximating that of a user's frontal dental arch. Moreover, the heights of the interior bristles at the inner rows are further shortened to follow a more concave cylindrical shape or to form a plane surface. The toothbrush of this design is an improvement to the conventional flat-trimmed toothbrush in terms of dental cleaning and gums stimulation but does not have the drawbacks of the designs found in the prior art.
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