Bad breath after tooth extraction may be due to poor oral hygiene, inflammatory infection of the extraction wound or dry socket. 1. After tooth extraction, the alveolar fossa inflammatory exudate and blood mix, odor, should be rinsed to maintain oral hygiene, light diet, to avoid bad breath or bad taste in the mouth. 2. Dry socket is a common complication of tooth extraction, the alveolar fossa blood clot falls off after tooth extraction, the extraction wound is exposed in the oral cavity, bacteria triggered by alveolar bone infection, the alveolar fossa appear foul-smelling liquid or even pus. Therefore, the mouth is so smelly after tooth extraction is due to poor oral hygiene, or the inflammatory infection after tooth extraction, pay attention to oral hygiene, you can go to the dentist for medical treatment.