Burning sensation occurs when the nerve
is damaged or is injured during the tooth extraction. Nerves are responsible for sensation in the tongue and lips and may get affected while giving the anesthesia
. The nerves may get squashed, bruised or stretched which could result in numbness
This kind of nerve bruising is usually not permanent but in the rarest of rare cases it might be permanent as well. The temporary phase might go on for a long time and may last from several days to several months. No one can actually say how long the nerve will take to get rid of the nerve bruising and come back to its normal mode of functioning.