At present, clinical anesthesia drugs commonly used in tooth extraction, there are three kinds of bupivacaine, lidocaine, ativacaine, as follows: 1, bupivacaine: bupivacaine is mainly used for surface anesthesia, can be extracted from loose milk teeth and permanent teeth. 2, lidocaine: lidocaine belongs to the amide class of drugs, less allergic reactions, toxicity is small, has a strong tissue penetration and diffusion, the local anesthesia is more effective, and is suitable for a variety of The extraction of teeth. Lidocaine has a certain anti-ventricular arrhythmia effect, so if the arrhythmia patients preferred extraction anesthesia is lidocaine. 3, Ativan: Ativan has a fast onset of anesthesia effect is better than lidocaine, but is not applicable to children under the age of four years old and pregnant women, Ativan is also suitable for all kinds of teeth extraction.