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.