Single Tooth Anesthesia (STA™) System is the first computer-controlled local dental anesthetic system where just one injection at a single tooth is all that's needed to scientifically, safely and predictably ensure single session injection precision. Delivers anesthetic below a patient's pain threshold. The STA Handpiece is engineered for an easier and more controlled fluid flow at greater volumes, resulting in the ability to provide pain-free, precise anesthetic delivery, regardless of required pressures.1-year warranty.