The present invention relates to an oral cleaner. An oral cleaner, according to the present invention, comprises: an air injection unit for injecting high-pressure air a cleaning solution tank in which a cleaning solution is stored an acceleration unit, connected to the cleaning solution tank by means of a first tube body and to the air injection unit by means of a second tube body, for, when high-pressure air is supplied from the air injection unit, withdrawing the cleaning solution from the cleaning solution tank by means of the pressure differential and then injecting same a nozzle unit which is connected to the acceleration unit by means of a tube body and through which the cleaning solution injected by means of the high-pressure air can be injected on the teeth and a switch unit for injecting or blocking the cleaning liquid by controlling the air injection unit.
