Painless filling is available and has been used in the clinic for a long time. The main purpose is to perform filling treatment after local anesthesia, because filling treatment can easily cause reflex pain in the pulp, so many patients are afraid of filling. The whole process will be finished in about half an hour, and because the patient does not feel pain, the filling effect is better and the inflammatory reaction of the pulp is reduced, so many hospitals are already promoting painless fillings. However, there is a situation that patients are advised not to take painless filling, that is, if the caries is close to the nerve and the doctor needs the patient’s cooperation to determine whether the nerve is infected, it is still recommended not to take anesthesia, because under anesthesia it is impossible to determine whether there is inflammation in the pulp, and it is easy to cause post-filling pain after filling.