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The pharynx (plural: pharynges) is the part of the neck and throat situated immediately posterior to (behind) the mouth and nasal cavity, and cranial, or superior, to the esophagus, larynx, and trachea.
When a tooth is pulled and when you rinse and water comes out of your nose, this is a sign of an oral fistula. An oral fistula is a hole from the extraction site into the sinus cavity. You will need to return to your dentist for treatment.