Technique:
Depending on the age and size of the patient a 25 or 27 gauge long or short needle may be used.
Lay the thumb on the occlusal surface of the molars, with the tip of the thumb resting on the internal oblique ridge and the ball of the thumb resting on the retromolar fossa. Support the mandible during the injection by resting the ball of the middle finger on the posterior border of the mandible.
The barrel of the syringe should be directed between the two primary molars on the opposite side of the arch.