The second molar, which is the seventh tooth counting from the middle, is a tooth in front of the wisdom tooth. The precautions for the extraction of the second molar are the same as those for the extraction of most teeth. After extraction, bite firmly on the compressed cotton ball or cotton roll for thirty minutes, spit out the cotton ball and roll after thirty minutes, do not brush your teeth, do not rinse your mouth, and do not lick and suck the extracted tooth with your tongue for twenty-four hours. At the same time, in terms of eating, it is recommended to eat warm, cool and soft food after tooth extraction, and not too hot or too hot food, in order to prevent stimulation of the extraction wound and cause secondary bleeding, specifically for the extraction of the second molar, attention must be paid to its relationship with the anterior teeth, especially with the posterior teeth for the presence of wisdom teeth, and of course this is best to be further observed before the operation.