how long does it take for numbing to wear off
How Long Does the Numbing from the Dentist Last? Local anesthesia is the injection of a solution that numbs the area where a dentist has to work on (tooth, gums, etc.) That solution can either contain epinephrine (adrenaline) or not. Epinephrine is added to the anesthesia solution to increase the numbing effect. Anesthesia that contains epinephrine is commonly used, and the numbing effect lasts from 2 to 4 hours. Rarely does it last more than that, although there have been cases where the numbing effect lasted for days.