Local anesthesia is usually used for tooth extraction, surface anesthesia can be used for loose milk teeth, infiltration anesthesia can be used for loose permanent teeth, and block anesthesia is used for extraction of solid teeth as follows. 1. Loose baby teeth: anesthetics are applied or sprayed on the tissues around the loose baby teeth to anesthetize the peripheral nerves and make the pain sensation in the superficial tissues disappear through surface anesthesia. 2. Loose permanent teeth: using infiltration anesthesia, local anesthetics is injected into the tissues, such as the superficial surface of periosteum or periodontal membrane, the anesthetics acts on the endings of the nerves to make them lose the ability to conduct pain and produce anesthesia effect. 3. solid teeth: use of block anesthesia, local anesthetic will be injected into the nerve trunk and its main branches nearby, in order to achieve anesthesia effect, the extraction of different teeth anesthesia of different nerves, such as the extraction of mandibular molar, should be carried out in the lower alveolar, lingual, buccal nerve block anesthesia. It is recommended to go to regular medical institutions to receive professional treatment.