| 摘要 |
Provided is a core/sheath composite filament for toothbrushes which exhibits excellent hardness, durability and ease-of-use when used in toothbrushes, is less prone to falling out when implanted into the bristle base, and makes it possible to improve stain-removal properties. Also provided is a toothbrush using said core/sheath composite filament. A toothbrush is configured using bundles of bristles configured from core/sheath composite filaments that have a square cross section in the plane perpendicular to the lengthwise direction and comprise a core (2), which is formed from a synthetic resin fiber, and a sheath (3), which integrally covers the core (2) and is formed from an elastomer that is compatible with the synthetic resin constituting the core (2). Bristle bundles configured from a plurality of the core/sheath composite filaments (1) are implanted in the center portion of a bristle base, and bristle bundles configured from a plurality of monofilaments formed from hard synthetic resin are implanted at the outer periphery of the bristle base.
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