It depends how much they inject you with. I have had 2-3 injections where the numbness lasted about 2 hours. But my last dentist visit Ihad to be injected 14 times and my mouth was still partially numb when I woke up the next morning ... -.-
Depends how many injections you get and the dosage that's in them. From my experience, one injection can last anywhere from half an hour to three hours.
Depends on the dose they give you. Usually last around 2-6. And also on what they will be working on, like to pull a tooth or to fill a cavity.
The local anaesthetic usually lasts for about an hour or two.
About 3 to 4 hrs in my experience
