An electric toothbrush, comprising a motor and a power supply circuit providing a driving power supply to the motor the power supply circuit comprises a current detection circuit (10) and a main control circuit (20) the current detection circuit (10) has a power supply input terminal (Vin), a power supply output terminal (Vout), a feedback output terminal (Imon), and a control receiving terminal (EN), and the main control circuit (20) has a feedback receiving terminal (Ichk) and a control terminal (CTRL) and the feedback receiving terminal (Ichk) is connected to the feedback output terminal (Imon), and the control terminal (CTRL) is connected to the control receiving terminal (EN). The current detection circuit (10) detects the current of the power supply output terminal (Vout), and feeds same back to the main control circuit (20), and the main control circuit (20) controls, according to the signal fed back, the on and off state between the power supply input terminal (Vin) and the power supply output terminal (Vout). When the current value of the power supply output terminal is abnormal, the main control circuit (20) controls the current detection circuit (10) to turn off the circuit between the power supply input terminal (Vin) and the power supply output terminal (Vout), so as to protect the safety of the motor.Linvention concerne une brosse à dents électrique, comprenant un moteur et un circuit dalimentation électrique fournissant une alimentation électrique dentraînement au moteur le circuit dalimentation électrique comprend un circuit de détection de courant (10) et un circuit de commande principal (20) le circuit de détection de courant (10) comporte une borne dentrée dalimentation électrique (Vin), une borne de sortie dalimentation électrique (Vout), une borne de sortie de rétroaction (Imon) et une borne de réception de commande (EN), et le circuit de commande principal (20) comprend une borne de réception de rétroaction (Ichk) et une borne de commande (CTRL
