Restricted mouth opening and nerve damage after tooth extraction are two problems. Usually during extraction of the posterior mandibular teeth, damage to the mandibular joint can be caused by such actions as splitting, chiseling, knocking, and prolonged wide mouth opening. Fractures, on the other hand, can be determined by taking a radiograph. Since the roots of the mandibular posterior teeth are closely related to the neurovascular that travels in the mandible, damage to the mandibular neurovascular can occur during tooth extraction, which is manifested as more than bleeding before and after extraction, and the sensation of numbness in the lower lip after the anesthetic effect wears off, and bleeding after extraction can be resolved after compression to stop bleeding. The numbness of the ipsilateral lower lip appearing from nerve injury depends on the degree of injury, most of them are harassment of the nerve by instruments or roots during tooth extraction, which can be gradually recovered after six months to a year, but if the nerve is broken, the possibility of complete recovery will be reduced or the recovery time will be longer, which needs to be repaired by regeneration of the nerve. The facial expression muscles are innervated by the facial nerve and have little to do with the extraction area, so basically it will not cause damage to the facial nerve, and it will not cause twitching and paralysis of the facial muscles. According to what you said, the analysis is that the jaw joint is damaged after tooth extraction, which is manifested by difficulty in opening the mouth and popping of the joint. If there is numbness of the lower lip, there may be damage to the mandibular nerve. Both of the above may be a matter of recovery time and gradual natural improvement, with no special treatment. It will not aggravate or change into other problems, so don’t worry too much.