An applicator for effecting an intraligamentary injection of a liquid anesthetic into a gingival sulcus of a dental patient, comprising: a hollow body section having a proximally located chamber and a distally located chamber, the proximally located chamber having an internal chamber diameter that tapers in a first section and a second section, the distally located chamber having a constant diameter that is less than the internal chamber diameter of the proximally located chamber, the proximally located chamber being in fluid communication with the distally located chamber with the proximally located chamber being configured to receive a bolus of the liquid anesthetic and the distally located chamber being configured to produce of jet of liquid anesthetic comprising at least a portion of the bolus of the liquid anesthetic received by the proximally located chamber; an elongated tip disposed on a distal end of the body section; a passageway extending through the elongated tip between the chamber of the body member at a proximal end of the elongated tip and the distal end of the elongated tip, the passageway forming an opening at the distal end of the elongated tip, the passageway having an internal passageway diameter less than the internal chamber diameter of the distally located chamber; and a coupling for securing the body section to a source of liquid anesthetic; characterised in that the elongated tip is substantially rectangular in cross-section, in that a width of the elongated tip is greater than a thickness of the elongated tip and in that the elongated tip has a distal end that is rounded and flexible to facilitate an atraumatic entry of the elongated tip into the gingival sulcus. a hollow body section having a proximally located chamber and a distally located chamber, the proximally located chamber having an internal chamber diameter that tapers in a first section and a second section, the distally located chamber having a constant diameter that is less than the internal chamber diameter of the proximally located chamber, the proximally located chamber being in fluid communication with the distally located chamber with the proximally located chamber being configured to receive a bolus of the liquid anesthetic and the distally located chamber being configured to produce of jet of liquid anesthetic comprising at least a portion of the bolus of the liquid anesthetic received by the proximally located chamber; an elongated tip disposed on a distal end of the body section; a passageway extending through the elongated tip between the chamber of the body member at a proximal end of the elongated tip and the distal end of the elongated tip, the passageway forming an opening at the distal end of the elongated tip, the passageway having an internal passageway diameter less than the internal chamber diameter of the distally located chamber; and a coupling for securing the body section to a source of liquid anesthetic; characterised in that the elongated tip is substantially rectangular in cross-section, in that a width of the elongated tip is greater than a thickness of the elongated tip and in that the elongated tip has a distal end that is rounded and flexible to facilitate an atraumatic entry of the elongated tip into the gingival sulcus.