Dentist gave me a novacaine shot two days ago and hit a nerve - now my left lip and chin is completely numb. is the nerve damage permanent?

Unlikely: You will most likely have improved sensation gradually returning over a maximal 3-4 weeks at most. But contact your dentist and inform of situation and have them examine area, as, on occasion, interval treatment might speed resolution.

Nerve damage: I have never seen or heard of permanent nerve damage from a dental injection alone. However, you need to call and discuss this with the dentist who just treated you. The numbness may be from something else such as an infection which would require treatment. There are medications that might help speed recovery. I would call now.

Probably not...: But you need to let your dentist know ASAP. In certain situations, medications can be given and low level laser therapy used to speed along the recovery process. Don't delay.

See an oral surgeon: Treatment of these injuries is very difficult and they are best treated if addressed early on with referral to an oral surgeon when necessary. Treatment usually involves counseling, education, mapping, medication (preventive corticosteroids) for pain and rarely surgery. Take care.

Recovery from: Nerve trauma occurs frequently but very slowly, nerves can grow. A neurologist can do tests and give you a better idea of recovery

No: most likely not should resolve over a few days time

Parathesia: Normally, the numbness is not permanent, but is unpredictable in terms of how long it will last. There are some cases that do not resolve, but most of these circumstances come from a surgical procedure that might have damaged the nerve (extraction, etc.)