Most of the dental treatments have been routinely performed under the local anesthesia and the effectiveness has also been proved safe. However, even not frequently dentists face some complications associated with the local anesthesia. In this report, the experience of the paresthesia after mental nerve block anesthesia for an implant placement of the mandibular premolar was presented to raise awareness of the complications related with local anesthetic procedure and to discuss about the causes, the proper treatments and the preventive approach of the paresthesia.