Dental local anesthesia is the principal means at our disposal for controlling the pain caused by our treatments and procedures. The importance of dental local anesthesia is so profound that it is impossible to imagine carrying out our work without it. This approach has considerable advantages and an excellent safety profile over other techniques for managing pain in our day-to-day activity as compared to sedation and general anesthesia. Furthermore, administration of local anesthesia is one of the most common procedures in clinical practice and is generally the first treatment administered. If its effect is inadequate, our work is complicated enormously"--