The oral cleanser now in use sprays water in straight line which makes it difficult to clean only the desired part. However, by adopting the 3D nozzle that envelops the teeth, this oral cleanser can clean the teeth top to bottom and left to right in "One-Stop." Also, with the water splash guard, the water is not sprayed to any unnecessary place, which makes it easy and efficient for anyone to use. There are no known oral cleaning method (oral cleanser) in the world that uses 3D nozzle, and patent registration has been completed for this characteristic, giving the device uniqueness and competitiveness.