A tip assembly for use with a dental tool which has an ultrasonic energy generator positioned therein, the tip assembly comprising: (i) an insert for attaching to the dental tool, the insert having a receiving portion ; a threaded housing having a first planar surface which can be threadably attached to the dental tool, a needle positioning member extending from the threaded housing in a direction away from the first planar surface, (ii) a needle having a passageway extending therethrough from a proximal end of the needle to a distal end of the needle , the passageway providing a single continuous flow path for delivering fluid from a reservoir at the proximal end of the needle to a root canal of a tooth at the distal end of the needle; (iii) a housing molded over the insert and at least a portion of the needle, the housing cooperating with the insert and the needle to maintain the needle in position relative to the receiving portion of the insert ; (iv) the receiving portion and the needle are planar; whereby the energy generated by the ultrasonic energy generator is translated into movement of the needle and the distal end of the needle which are planar to a longitudinal axis of the needle to provide optimum cleaning to the root canal, characterized in that - the receiving portion positioned at the end of the needle positioning member having a needle receiving slot, whereby the proximal end of the needle engages a needle positioning portion of the needle positioning member , the needle being positioned and maintained in the receiving slot by the housing ; and in that - the needle has a straight portion and a S-shaped portion , the S-shaped portion cooperates with the receiving portion of the insert , and wherein vibrations induced on the needle by the ultrasonic energy through the threaded insert are amplified due to the free vibration at the tip of the needle whereby a fluid is pumped or forced through the passageway of the needle to the root canal. (i) an insert for attaching to the dental tool, the insert having a receiving portion ; a threaded housing having a first planar surface which can be threadably attached to the dental tool, a needle positioning member extending from the threaded housing in a direction away from the first planar surface, (ii) a needle having a passageway extending therethrough from a proximal end of the needle to a distal end of the needle , the passageway providing a single continuous flow path for delivering fluid from a reservoir at the proximal end of the needle to a root canal of a tooth at the distal end of the needle; (iii) a housing molded over the insert and at least a portion of the needle, the housing cooperating with the insert and the needle to maintain the needle in position relative to the receiving portion of the insert ; (iv) the receiving portion and the needle are planar; - the receiving portion positioned at the end of the needle positioning member having a needle receiving slot, whereby the proximal end of the needle engages a needle positioning portion of the needle positioning member , the needle being positioned and maintained in the receiving slot by the housing ; and in that - the needle has a straight portion and a S-shaped portion , the S-shaped portion cooperates with the receiving portion of the insert , and wherein vibrations induced on the needle by the ultrasonic energy through the threaded insert are amplified due to the free vibration at the tip of the needle whereby a fluid is pumped or forced through the passageway of the needle to the root canal. <EOS>