The present invention discloses a method for manufacturing a mouthpiece in which a tooth groove is formed such that teeth forming a dental arch are inserted into the tooth groove, and the tooth groove covers an end surface of a dental crown engaging with a counter tooth of the teeth, and the mouthpiece manufactured using the method. The purpose of the present invention is to provide a method for manufacturing a mouthpiece of structure which is capable of alleviating an impact applied to teeth, gives smooth wearing sensation, and has improved structural stability and durability, and the mouthpiece manufactured using the method. A method for manufacturing a mouthpiece according to the present invention comprises: a step (a) of molding a multilayered core frame including a rigid core layer which forms a bottom surface of the tooth groove, and a soft core layer which is formed on an outer part of the rigid core layer and a step (b) of forming a multilayered tooth frame on an outer part of the core frame, the multilayered tooth frame including a first sidewall and a second sidewall which form both sidewalls of the tooth groove by laminating a multilayered cover sheet onto the core frame, and a home base which covers the core frame by connecting the first sidewall and the second sidewall. The step (b) comprises a step (b1) of integrally fusing the second surface layer and the soft core layer by laminating the cover sheet including a rigid first surface layer which forms one side surface of the cover sheet and a second surface layer which forms other side surface of the cover sheet as the same material as the soft core layer onto an outer part of the core frame.COPYRIGHT KIPO 2016본 발명은 치열궁을 이루는 치아들(Teeth)이 끼워지며 상기 치아들의 상대치와 맞물리는 치관의 끝면을 커버하도록 치아홈이 형성된 마우스피스 제조방법 및 이를 이용해서 제조되는 마우스피스를 개시한다. 본 발명에 따른 마우스피스 제조방법은 상기 치아홈의 바닥면을 형성하는 경질 코어층과 상기 경질 코어층의 외부에 구비되는 연질 코어층을 포함하는 복층의 코어 프레임을 성형하는 (a)단계 그리고 복층의 덮개 시트를 상기 코어 프레임에 적층해서, 상기 치아홈의 양측벽을 형성하는 제1측벽과 제2측벽 및 상기 제1측벽과 제2측벽을 연결해서
