Most of the teeth are still living pulp, and the pain of the child is greater during the treatment. Some children will suddenly throw their heads and pull the doctor’s arm due to the pain at the moment of pulp opening, which will easily cause damage to other tissues and organs of the children and even break the medical equipment. The STA System is a computer-controlled local anesthetic injection system. Compared with traditional local anesthesia, the STA System has the following advantages: 1. 2.The speed of anesthetic delivery is controlled by computer in terms of speed and measurement, which is not only painless while injecting local anesthetic, but also reduces the amount of anesthetic used, making it safer and more effective. 3.It is possible to perform single tooth anesthesia without causing numbness of the lips or tongue at the same time. 4.To make the patient enjoy a comfortable injection, truly painless.