Thanks for posting your query.
How much time it took to get it removed and does dentist
need to cut the bone along with it.??
As such after extraction there are nil chances of flattening of face because that area is covered by the coronoid process of mandible and lot of muscle and fat tissues.
Only chance it if he has to remove the chunk of bone along with the tooth.
You can go for extraction of other side as every case is different. explain your dentist about your previous experience. he will take care of you.