<qa>  What are patients ages 16 to 35 who are in good health?Patients ages 16 to 35 who are in good health and have been referred for removal of impacted wisdom teeth; who are not allergic to aspirin or other nonsteroidal anti-inflammatory drugs known as NSAIDs, sulfites, or certain anesthetics; who are not pregnant or nursing; and who are willing to have a biopsy before and after dental surgery are eligible for this study. 