A dental ultrasonic drug delivery system capable of accurately cleaning the inside of root canals and killing bacteria in dentin tubules is provided. The dental ultrasonic drug delivery system delivers a drug to a target using an ultrasonic delivery device 800 . The drug is delivered in a mixed state with nanobubbles. A dental therapeutic probe for applying ultrasound is attached to the ultrasonic delivery device 800 . The dental therapeutic probe is selected from: (1) a root canal insertion probe 100 which is configured to be inserted into a root canal and causes ultrasound to propagate in the root canal； (2) a dental caries therapeutic probe which causes ultrasound to propagate in a dental caries portion； (3) a periodontal disease therapeutic probe which applies ultrasound to a periodontal disease portion； and (4) a hyperesthesia therapeutic probe which applies ultrasound to hyperesthesia portion.
