Brief Answer : Hemifacial PALSY or BELL'S PALSY..
Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your health concerns..
As per your complain dropping and numbness of the face can be due to damage to the
Facial Nerve during the
local anesthesia injection for tooth extraction..
It is due to
nerve damage and not due bone loss..
The nerve damage caused by pricking of nerve by needle used in injection is mostly transient and recovery takes place almost completely but the time duration is uncertain and can take from days to weeks and even months and years to recover completely..
In case if you have difficulty in closing the eyelid also you must take care and cover the eye while sleeping and instill
artificial tears to prevent dryness of eye..
Taking a steroid therapy like
prednisone under the supervision of a
dentist or physician can help in increasing the chances of complete and faster recovery..
Apply warm packs over the affected side..
In case if you do not find any improvement in even 5 to 6 months you should
consult a Neurologist and get evaluated...
Hope this information helps and thanks for writing to Healthcare Magic..
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Thanks and regards..
Dr.Honey Nandwani Arora..