The invention provides an electric toothbrush. The electric toothbrush comprises a toothbrush head, a toothbrush head insert and a motor shaft, the toothbrush head is provided with an installation hole, the toothbrush head insert is in interference assembly with the toothbrush head through the installation hole, the motor shaft is connected to the tail part of the toothbrush head insert in an inserting manner, a motor shaft is sleeved by a flexible rubber gasket, the flexible rubber gasket is arranged between the motor shaft and the inner wall of the toothbrush head insert in an interference manner, and the interference amount is 0.05-0.15 mm. According to the electric toothbrush adopted in the technical scheme, the toothbrush head, the toothbrush head insert and the motor shaft are tightly connected through the structure of the electric toothbrush , so that loosening is avoided, and the noise produced in the working process of the electric toothbrush is reduced; and in addition, the flexible rubber gasket has certain elasticity, so that the motor shaft still keeps tight connection with the toothbrush head insert after being inserted and pulled for multiple times, the loosening ofthe motor shaft and the toothbrush head insert is further avoided, the noise is further reduced, and the motor shaft is convenient to insert and pull while the close matching of the motor shaft and the toothbrush head insert is guaranteed.