Healthy volunteers who require removal of their third molars are eligible for this study. Participants will have oral surgery for tooth extraction after receiving a local anesthetic (lidocaine) in the mouth and a sedative (midazolam) through an arm vein. On the evening before and 1 hour before surgery, patients will be given a dose of either the standard anti-inflammatory drug ibuprofen (Advil, Nuprin, Motrin), or Celebrex, or a placebo (a pill with no active ingredient). After surgery, a small piece of tubing will be placed in each extraction site and tied to an adjacent tooth to hold it in place. Samples will be collected from the tubing to measure chemicals involved in pain and inflammation. Patients will stay in the clinic for up to 6 hours after surgery while the anesthetic wears off and will complete pain questionnaires. During that time, they may receive acetaminophen plus codeine (Tylenol 3), if needed, for pain. The tubing then will be removed and the patient discharged with standard pain medication.