Half a year after the extraction of retained teeth, the neighboring teeth always hurt, considering the caries, neighboring teeth damage, pulpitis and other diseases triggered. 1. Caries, six months after the extraction of retained teeth neighboring teeth always hurt may be the usual diet process food blockage, not timely cleaning, may lead to neighboring teeth caries, so this symptom will appear. 2. Neighboring teeth damage, if the extraction process on the neighboring teeth caused by stimulation, resulting in neighboring teeth damage, root exposure, increased sensitivity may appear this symptom. 3. Pulpitis, patients with pulpitis may experience this symptom due to the stimulation of the nerve tissue in the pulp area. If pain occurs frequently, it is recommended to consult a doctor in time for examination and treatment.