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Yes, dentist can use local anesthetic. What additional info do you need?
Generally, yes, most root tips can be removed without putting the patient to sleep. In fact, I often take all the teeth out of the upper or lower arch at one time with just local anesthetic. Of course, it depends on the dentist being comfortable performing root tip removal and on the patient's anxiety level. If the root tip is from an already extracted tooth and bone has completely covered it, it is possible an oral surgeon would need to use general anesthesia. However, if the root tip is partly visible it should not be necessary- very often these are the easiest extractions.