A noncontact ultrasonic dental cleaning device is designed in this study. It addresses the limitation of a transducer’s acoustic transmitting power due to the space in the oral cavity by combining 12 ultrasonic horn units in parallel to form a braces-type array structure. Results of acoustic-structural coupling finite-element simulation and regression analysis show that the piezoelectric-phase type is PZT-5H, which features a hollow conical ultrasonic horn in the acoustic-permeable module. The average acoustic power radiated to the dental surface is 2.32 W, and the minimum positive-and negative-phase acoustic pressures are 794.668 and -800.854 kPa, respectively, between 300 and 400 kHz. The acoustic field encompassing the entire dentition can be generated by sweeping frequency cleaning in this frequency band. Finally, the device can achieve complete supercavitation and noncontact dental cleaning.