Often paraesthesia is caused due to the needle injury. When the dentist inserts the needle for a block, the patient might experience a sharp sensation on the tongue equivalent to that of an electric shock. This is known as paraesthesia and is defined as a change in the sensation or anesthesia that is persistent and the duration generally extends. This condition cannot be prevented and is a complication in some patients who undergo a dental treatment. Though it is commonly seen in the implant therapy, paraesthesia is more of a dental malpractice.
The feeling of the electric shock is felt when the needle comes in close contact with a nearby nerve. This is enough to develop paraesthesia. Severing of the nerves with a local anesthesia and small gauge needle is uncommon. The exact cause of paresthesia has not been ruled out, but it is believed that the block happens because of using 4% solutions of local anesthesias. In case a paresthesia occurs, then it usually gets resolved within some days, weeks or months, but if it lasts for more than 6-9 months, then it is considered to be permanent.
When the paraesthesia is due to a surgical trauma, then getting help from an oral and maxillofacial surgeon is recommended. They assess that if a surgical intervention can be used to fix the problem. In case the paraesthesia is due to the anesthesia given locally by the dentist, then he/she does the following: