A patient has a sinus tract on tooth #3, and exudate is now coming out of it. What type of cells are predominantly found in this exudate?

Purulent exudate draining from an active sinus tract (representing an acute or actively suppurating phase of infection) is composed predominantly of neutrophils, the primary cell responsible for acute inflammatory/purulent response, in contrast to the lymphocytes/plasma cells more characteristic of established chronic lesions.