A vibrator for attaching composite resin to a tooth includes a housing, a vibration motor accommodated in the housing and configured to generate vibration, a micro-computer configured to control an operation and a vibration frequency of the vibration motor, a vibration tip configured to couple with one side of the housing to be exposed to an outside of the housing and to transfer the vibration to the composite resin, a vibration bushing provided at one end of the vibration tip and accommodated in the housing, and a control switch provided on one side of the housing and configured to generate a vibration motor control signal in response to a user contacting or pushing the control switch.