What will happen next if my tooth won't numb again for extraction? we tried nitrous with lidocaine and another anesthetic and my tooth wouldn't numb!

Different technique: The anesthetic solution is not getting to the where it is needed to numb your tooth. A different delivery technique is needed. Intraligamentary anesthesia should be tried next and if that is not completely successful, intraosseous anesthesia will work. However, your dentist may not use these techniques.

See oral surgeon: If you were treated by an oral surgeon, they may have tried a few more techniques. Block anesthesia can be used, as well as ligamentous delivery . Septocaine works well. Sometimes you can combine more than one type of anesthesitic to get best results. If no success, then oral surgeon can offer you sedation, where you are asleep for the treatment. If badly infected, harder to numb.

See below: Some people do seem to have problems with local anesthetics not working. The dentist can work with you and provide other options.