Hello, The injection causing a zapping pain means the needle had direct contact with the nerve. Most cases of paraesthsia from an injection will not cause permanent damage and gradual sensation will return. Concerns are greater with an extraction, oral surgery or implant placement due to actual risk of cutting the nerve in these more invasive procedures. The tingling sensation is a sign that the nerve is responsive and in the process of trying to return to a normal state. Anti-inflammatory medications such as Tylenol or Motrin may assist healing. Try B complex for two weeks. Inflammation can cause pressure on nerves and delay return to normal function. If the filling was very deep, there is a risk of an infection being present. This will require a return visit to the dentist for an evaluation. Antibiotic medication may be prescribed. Monitor the area around the tooth for swelling, a bubble, pain, hot sensitivity or inability to put pressure on the tooth. Your dentist will advise you if further treatment is needed. I would not expect your filling to be removed unless additional treatment is necessary such as a root canal. Keep your dentist informed of your remaining numbness. Report any changes. Thank you for your inquiry. I am glad to answer additional questions.