This invention relates to a bristle-less toothbrush structure (II), which includes an ultrasonic oscillator, the ultrasonic oscillator has a main body built with a plurality of ultrasonic oscillation sheets, and its one end is connected with a transmission oscillation rod abutting the ultrasonic oscillation sheets. The transmission oscillation rod is sleeved with an outer rod sleeve. The outer rod sleeve is a hollow plastic tube and is higher than the transmission oscillation rod and extends with a protruding section to separate the transmission oscillation rod from touching the teeth directly when cleaning the teeth. The protruding section is equipped with at least one water inlet hole on its surrounding wall so that a circulation space is formed by the interior space, opening, and the water inlet of the protruding section as well as a control circuit module using a power cable to electrically connect with each of the ultrasonic oscillation sheets for controlling the on/off of the ultrasonic oscillator. As such, the transmission oscillation rod can be safely extended into the to-be-cleaned portion, so that the output oscillation wave will contact with the water that is entering the interior of the protruding section to create the cavitation effect for achieving the ultrasonic thorough cleaning effect on the to-be-cleaned portion.本發明係在提供一種無毛牙刷結構二,其包含一超音波振盪器,該超音波振盪器包含一內藏複數超音波振盪片的本體,在其一端連結一與超音波振盪片抵接的傳導振盪桿,該傳導振盪桿外側套結一外桿套,該外桿套為一中空膠管並高出傳導振盪桿而延伸一凸出段,以隔離傳導振盪桿清洗時直接觸及牙齒,且該凸出段環壁貫設至少一入水孔,以由該凸出段內部、開口及入水孔形成一循環空間;以及一控制電路模組,以電源線電性連結各超音波振盪片控制該超音波振盪器啟閉;藉此,傳導振盪桿即可安全伸入欲清洗部位,使輸出振波與進入凸出段內水接觸產生空穴效應,以達直接對欲清洗部位進行超音波振盪徹底洗淨之效。10‧‧‧超音波振盪器11‧‧‧超音波振盪片12‧‧‧本體13‧‧‧傳導振盪桿14‧‧‧外桿套141‧‧‧凸出段142‧‧‧入水孔143‧‧‧凸出段開口15‧‧‧螺桿16‧‧‧迫結元件
