| 摘要 |
<p>An objective of the present invention is to avoid bristle breakage or bristle wear when a toothbrush is used repeatedly over an extended period. Provided is a toothbrush (1) which comprises a handle body (10) and a head part (20) which extends from the leading end of the handle body (10), and in which a plurality of staples (21) of a plurality of bristles (21a) is embedded in the head part (20). All or part of the plurality of bristles (21a) are formed from a polybutylene terephthalate filament. The filament has a zero shear viscosity at 240°C in a range of 200-300Pa∙s, and a rupture elongation per unit area of 2600% or less.</p> |
