Odontogenic sinusitis, refers to maxillary sinusitis, the main symptoms are nasal congestion, pus flow, smell obstruction, toothache and so on. 1. Nasal congestion: mainly manifested as blockage of the nasal cavity on the affected side. 2. Runny nose: mostly in one side of the nasal cavity, may be accompanied by nasal odor. 3. Olfactory disorder: it may cause subjective sense of bad smell, but most of the olfactory disorder is temporary, when the acute inflammation gradually subsides, the sense of smell will be improved. 4. Toothache: mainly manifested as maxillary tooth pain. 5. Other: patients also have headache, maxillary sinus anterior wall pressure pain and other discomforts, if triggered by the cyst, once the infection occurs, but also the affected side of the pain, fever, redness and swelling and other symptoms. Patients with the above symptoms, suspected the existence of odontogenic sinusitis, should promptly seek medical treatment to improve the relevant examinations, such as X-ray, CT, nasal endoscopy, etc., so as to clarify the diagnosis of the disease, and comply with the doctor’s instructions for appropriate treatment.