For a typical procedure, the Wand STA system numbs faster and more accurately. Uncomfortable numbness seems to disappear faster.  A busy professional can now have a cavity filled at 10:00 a.m. and attend a business meeting at noon without the facial numbing that can cause slurred speech and drooling. Limited doses of anesthesia also reduce hepatotoxicity (liver toxicity) which is an added benefit of using the Wand STA.