The present invention relates to a rubber band on a tap for brushing teeth and, more specifically, a rubber band on a tap for brushing teeth which is allowed to wash the inside of the mouth by connecting the rubber band to the tap. According to an embodiment of the present invention, when washing the inside of the mouth, the rubber band on the tap for brushing teeth is allowed to conveniently wash the inside of the mouth in a sanitary manner and to prevent water being wasted by making holes for spraying water on the end part of the rubber band, comprising an opening-closing valve which tightens or releases a path in which water flows like a screw.수도꼭지에 고무 줄을 연결해 입안을 세척할 수 있도록 하는 것.고무 줄 끝에 분사되는 구멍을 뚫어 입안을 헹굴 때 물의 낭비를 방지하면서 편리하고 위생적으로 입안을 헹굴 수 있도록 한다.
