Can Droopy Eyelid Caused by Nerve Injury Recover by Itself?

I find it hard to believe that your droopy eyelid is in any way related to your recent dental work.

My suggestion is that you see a physician to further diagnose your situation and recommend treatment if necessary.

The oculomotor nerve and sympathetic nervous system both provide innervation to the eye that keeps the eyelid open. Therefor any injury to these nerves can result in eyelid droopiness. It is possible that nerve blocks may have induced the observed nerve injury. I dont' quite understand the timing of the injury and this is an important aspect of providing you with advice. In any event it is likeley that the injury will resolve over time.

It sounds like you had a bells palsy. This is coincidental in relation to the dental work. It can take up to 6 months for a bells palsy to recover and in 15% of patients they do not recover well. See a neuroophthalmologist for this.

A droopy eyelid can be caused by various reasons including nerve injury. Oral surgery typically does not make an eyelid droopy. See a physician to rule out medical conditions that may be the cause of your eyelid droop. Addressing this may minimize the asymmetry. Other than that, blepharoplasty surgery is likely to be the best option for a droopy eyelid.

Elizabethlee,
I recommend that you get to a doctor for an examination.  There is no reason that you should have a droopy eyelid from a tooth extraction.  You may have some other underlying condition that coincidentally surfaced at the same time as your tooth problem.  Good luck!

Droopy eyelids after other surgeries or injuries can improve. It all depends on the  patients individual condition.
That being stated, many months to a year of observation and measurement before having any surgery would be advised.