brush portion 300 and an adapter portion 400 the grip portion 100 is disposed therein with a battery not shown and a motor not shown the grip portion 100 is disposed at one lateral wall thereof with a power switch 110 that is circuitally connected to the battery not shown and the motor not shown the power transmitting unit 200 is cylindrically shaped and coupled to one end of the grip portion 100 the power transmitting unit 200 receives the power from the motor not shown formed inside the grip portion 100 and vibrates thereby the power transmitting unit 200 is formed at one lateral wall thereof with an aperture 220 the interdental brush portion 300 includes a brush holder 310 for insertion into the adapter portion 400 and a brush 320 fixed to the other end of the brush holder 310 one end 311 of the brush holder 310 may be cylindrical as shown in fig3 or may be of plate shape as shown in fig1 and 2 the end 311 may carry a variety of shapes the adapter portion 400 is coupled at one end thereof to the power transmitting unit 200 and the other end of the adapter portion 400 receives the interdental brush portion 300 now the adapter portion 400 will be described in detail with reference to fig4 and 5 the adapter portion 400 comprises a connecting portion 410 an extension portion 420 and an interdental brush holder 430 the connecting portion 410 is surrounded on the peripheral surface of the cylindrical power transmitting unit 200 the connecting portion 410 is disposed at one lateral wall thereof with a fixing hook 411 that is hitched.