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|1. (WO2017155252) DUAL-STRUCTURED FILAMENT|
|Inventors:||KANG, Ki Tae
KIM, Sung Jin
HWANG, So Hui
Disclosed is a dual-structured filament comprising: a triangular bar-shaped core; and a sheath in the center of which the core is embedded, wherein the sheath has the shape of an inverted triangular pipe having the core embedded in the center thereof. The filament according to the present invention comprises core and sheath made of differing materials, and has high strength and durability as well as superb flexibility and elasticity to thus reduce irritation and damage to the gums from tooth brushing and double the effectiveness thereof.