Q: What is local anesthesia?
A: Topical anesthetics are applied to mouth tissues with a swab to prevent pain on the surface level. Your dentist may use a topical anesthetic to numb an area in preparation for administering an injectable local anesthetic. Topical anesthetics also may be used to soothe painful mouth sores.
Injectable local anesthetics prevent pain in a specific area of your mouth during treatment by blocking the nerves that sense or transmit pain and numbing mouth tissues. They cause the temporary numbness often referred to as a "fat lip" feeling. Injectable anesthetics may be used in such procedures as filling cavities, preparing teeth for crowns or treating periodontal (gum) disease.