Your body. It is totally dependent on how your body metabolizes substance such as local anesthetic. Some people are fine after a couple of hours, some take all day for the anesthetic to wear off.
Mtabolism. Some people's metabolism breaks down the Lidocaine more slowly then others. Also, it depends on how much was used to numb the area. The more used usually the longer it takes to breakdown.
I have a true, tested allergy to xylocaine (lidocaine). I've used carbocaine ok for years. Could I develop an allergy to it as well? I need some major dental work and I always worry that I will have a reaction.
Local Anes Allergy. It is always possible to develop an allergy but the likelihood is extremely small. I have never personally heard or seen a patient allergic to Carbocaine. You can always discuss this with an Allergist and be tested first by small subcutaneous injection prior to procedure. Read more...